US1798703A - Induction train-control system - Google Patents

Description

March 31, 1931. F. M. ROSENZWEIG 1,793,703

INDUCTION TRAIN CONTROL SYSTEM Filed May 4, 1923 11v VENTOR 5 6 E H M M w m r W A an Patented Mar. 31, 1931 -ATIT FFlCE FRED M. ROSENZWEIG, OF NIAGARA FALLS, NEW YORK, ASSIGNOR TO THE REGAN SAFETY DEVICES COMPANY,

YORK

.INC.,.OF new YORK, N. Y., A conrona'rron on NEW INDUCTION 'J.RAI1\T-CO1\'|'TROI SYSTEM Application filed May 4, 1923. Serial No. 636,553.

This invention. relates to automatic train control systems, and has special reference to the provision of an improved automatic train control system of the induction type.

11 principal object of the present invention comprehends the provision of an induction train control system in which train carried mechanism is operated to produce a plurality of diiferenteffects responsive to the cooperation between vehicle carried and roadside inductor means, the construction and the cooperation being such that the vehicle carried inductor means is influenced by the roadside inductor means to produce a controlling, such as a tripping action ofthe vehicle caried mechanism under one roadside condiion and is influenced by theroadside inducor means under one or more different roadside conditions to produce a resetting action yof the-vehicle carried mechanism.

A. further principal object-ofithe present invention relates to the provision of an inductive system of thetype referred to in which the vehicle carried and roadside inductor means are operated by means of a vehicle carried source of energy.

A still furtherprincipal objectofthe invention includes the provision of system of the nature referred to in which the vehicle 0 carried and roadside inductor means are constructed so as to cooperate for producing a controlling or trippin operation of the train carried mechanism under a danger roadside condition, and for producing a resetting 5 action of the vehicle carriedmechanism under a safe or clear roadside condit on when the same has been trippechthe roadside inductor means being however inoperative toproduce any change in the vehicle carried mechanism under a safe or clear roadside condition when the said vehicle carried mechanism has not been tripped.

Further objects of the invention include the provision of a simplified induction system in which a vehicle carried inductor is-em-.

ployed for energizing the vehicle carried mechanism, the said inductortbeing influcnccd. b the roadside inductor means under one roadside condition for producing the controlling action of the vehiclecarriedmechap Sion of a system of this nature in which the parts ofthe system are coordinated toproduce proceed, proceed at caution and stop effects on the vehicleinresponseto clear, caution and x.dange ,r conditions onthe roadside; andthe provision ofimproved means amplifying: the energyinductively received for producing the resetting operation of the vehicle carried mechanism.

To the accomplishment ofthe foregoing and such other objects as may hereinafter appear, my invention consists in the elements and their relation one tothe other, as hereinafter particularly described and sought to be defined in the claims, reference beinghad to the accompanying drawings which show a preferred embodiment of my invention and in which: 7

Fig. 1 is a diagrammaticvie-w showing. the vehicle carried mechanism andthe roadside mechanism; associated therewith, v

Fig. 2 is. a diagrammatic view. showing one means for amplifying.- the energy inductively received by parts ofthe vehicle carried mechanism, and

Fig; .3 is a view of a modified form ofenergy amplifying means.

Before describing in detail thesystem/of my invention, I will briefly premisethat in vehicle carried and roadside inductor means AB cooperating to produce a controlling operation of the valve V under one or more roadside conditions such as a danger or caution condition, to modify the operation of the valve V under other roadside conditions such as a clear or caution roadside condition and to prevent any controlling operation or modifying operation of the valve V as when the train is running clear,

under clear roadside conditions, or when running at caution under caution roadside conditions.

The valve V may be any suitable valve for controlling the flow of air in the train line of an air bra re system, such valve being preferably of the type shown in the patent to A. G. Shaver No. 1,411,526 of April 4, 1922. The valve V is controlled by means of an electromagnet 10 which is normally energized by a vehicle carried circuit designated for convenience as h and comprising the generator G, conductors 11, 12 and 13, contact 14 which is normally closed by the energization of a relay F, conductor 15, conductor 16, coil of electromagnet- 10 and conductors 17, 18 and 19.

In the preferred embodiment of my invention the circuit h is controlled and operated to produce proceed, proceed at caution and stop effects in response to clear, caution, and danger roadside conditions. Under clear roadside conditions the circuit h is closed at the contact 14 due to the energization of the relay F, which relay is deenergized under danger roadside conditions to efiect the opening of the contact 14 and the opening and the deenergizing oi the circuit h and electromagnet 10 respectively. Undercaution track conditions the circuit h is controlled by a branch or partial circuit arranged in parallel with the contact 14, the said branch or partial circuit comprising the conductor 20, a speed circuit controller 21,

, the contacts of which are closed when the vehicle is traveling at or below a predetermined speed and are opened when the vehicle exceeds such speed, conductor 22, contact .13 controlled by a relay H, and conductor 24. Under caution track conditions the relay H is energized to close the contact 23, placing the circuit h under the control of th speed circuit controller 21 so that when the speed of the vehicle under the caution track conditions is at or below the predetermined or fixed speed, the electromagnet 10 is encrgized to permit the train to proceed under restriction; and when such speed of the vehicle is exceeded, the electromagnet 10 is deenergized to operate the train Venting valve V. to bring the train to a stop.

The relays F and H are operated by means of the vehicle carried source of energy G and are controlled by the cooperation of the vehicle carried and roadside inductor means 1 A-B. The relay F comprises a two-element relay having the field f and the armature f arranged in series in a stick circuit which may be designated for convenience as 2' comprising the contact 25 controlled by the relay F, the conductor 26, conductor 27, the coil of an inductor element 7), conductor 28, condenser 29, conductor 30, relay element f, conductor 31, relay element f, conductor 82, and conductor 33. This circuit 2' is normally energized by a circuit, which for convenience may be designated as is, comprising the generator G, conductor 11, conductor 34, the coil of an inductor element a, conductor and conductors 18 and 19. The elements a and b are inductively related so that under normal conditions with the circuit 2' closed, the relay F is energized to maintain its contacts 14 and 25 closed.

The relay H also comprises a two-element relay having the field h and the armature 7L2 arranged in series in a circuit which may be designated as Z comprising a contact 36 which is open under normal conditions and which is closed when the relay H is energized in response to caution conditions, a conductor 37, a conductor 38, a condenser 39, a conductor 40, the coil of the third inductor element 0, the conductor 41, relay element 7L conductor 42, relay element h, and con ductor 43. The inductor 0 is also inductively related to the energizing inductor a, so that when the circuit Z is closed, the relay H will be energized from the energizing circuit is and the generator G. Condensers 29 and 39 are provided in the circuits 2' and Z respectively, for the purpose of making these cir cuits normally substantially resonant.

Cooperating with the inductor elements a, b and c of the vehicle carried inductor means A, there are provided corresponding inductor elements a, b and c forming part of the roadside inductor means B, the inductor elements a, b and 0 being arranged in spaced relation between the rails of the track corresponding to the spacing of the vehicle carried inductor elements a, Z) and 0, so that inthe movement of the vehicle and the vehicle carried mechanism in the direction as indicated by the arrow in Fig. 1, the vehicle inductor elements will move over so as to be influenced by and to influence the corresponding roadside inductor elements. More specifically, the roadside inductor elements a, b are arranged to cooperate with the vehicle carried inductor elements a and b to produce a controlling operation of the vehicle carried relay F, and to this end the inductor elements a, b are arranged in series in a circuit which may be designated as 0?. including the coil of the inductor element a, the conductor 44, ghe coil of the inductor element 7), conductor 45, the coil of another roadside inductor d the function of which will be made clear hereinafter, conductor 46, a contact 47 closed under clear track concarried cir ditions and controlled by a distant roadside relay D, conductor 48, contact 49 closed under clear track conditions and controlled by a home or track relay T, conductor 50, condenser 51, and conductor 52, the condenser being provided in this circuit to correct the impedance fact-or thereof. Also the roadside inductor elements a and c are arranged for cooperation with the vehicle carried inductor elements a and 0 respectively to produce a controlling operation of the ve hicle carried relay H, and to this end these roadside inductor elements are arranged in a circuit generally designated as 92 comprising the coil of the element a, the conductor 53, the coil of the inductor element 0, conductor 5%, the coil of another roadside element 6 the function of which will be made clear hereinafter, conductor 55, a back contact 56 normally open and closed when the relay D is deenergized, conductor 48, contact 49, conductor 50, condenser 51, and conductor 52. With this described construction it will be clear that when the home and distant relays T and D are both energized, as under clear track conditions, the-inductor circuit on will be closed; that when the distant relay D is deenergized. as under caution track conditions, the inductor circuit on will be opened and the inductor circuit a closed; and that when the home relay T is deenergized, this being in response to danger track conditions, the opening of the contacti) will open both of the inductor circuits m and n.

The operation of the system thus far described is as follows: When the train running without restriction between control stations, the energizing inductor (4 functions in the nature of the primary of a transformer, the secondary of which is the inductor Z) which is energized for operating the relay F to maintain the train control circuit 7: normally closed. When the train reaches a control station the vehicle carried inductor ele ments and b more over the roadside inductor elements a, b, and when the conditions ahead are clear, the vehicle inductors a, b ar unintluenced due to the fact that the roadside inductor circuit m is closed, the vehicle in-nrctor elements being influenced, however, to produce a controlling condition in the relav when the inductor circuit at is opened due iinier to caution or danger roadside conditions. With the circuit at open, the inductor elements a and 0 modify the reluctance of the magnetic circuits of he vehiclecarricd incuctors a and 5, the change in the relucta of the in V it circuit Z) having the etl ect of changing th impedance of thctrain t '2', ,h the resu tin effective deenergization of t 1e control re y F. With the circuit at closed, however, in response to clear roadside conditions, the reluctance of the magnetic circuits is not substantially va- 1" ind theimpedance oft-he circuit 2' is maintained so thatthe relay F is uninfiuenced. Thus under danger conditions'the relay F is deenergizechopening the control circuit h at the contact 14 to bring the vehicle to a halt, and opening the stick circuit tomaintain the relay F-deenergized after the trainpa. cs beyond tie control station. Similarly when the train .is running under caution (0 d "one between control stations and the v le carried circuit Z is closed for energizing therelay Has will appear farther hereinafter, the vehicle-carried inductor elements a ture of a trans ormer, the element a acting as the pri: -ary or energizing inductor, and the element 0 as the secondary or receiving inductor for energizing the circuit Z and in itaining the same energized. When a train running under caution conditions reaches a caution station, the circuit at is closed and the movement of the vehicle carriedinductors (a, 0 over the roadside inductors a, 0 produces no controlling effect on. the circuit Z. 1;, however, a train running under caution conditions reaches a danger control station, the vehicle inductor elements-c and 0 are influenced by the inductor elements a, 01- in the open circuit a to change the impedance of the train carried circuit Z for producing an effective deenergization of the relay H, the deenergization of this relay causi t-h o eni-ng of the-contrrlc-ircuit ll attne co ct23-to bring theveh-icleto a halt and causing the opening of the stick circi Z which remains open after the train has moved beyond the control station. it will thus be seen that with the provision of the system described, a'train running-under clear station uninfluenced and a train runningunder caution conditions will pass a'caution station nninfiuenced, a controlling operation of the train being, however, obtained when a train running under clear conditions reaches a caution or danger station and when a train running under caution conditions reaches a danger station, the controlling eflect consisting in a tripping of the train mechanism, this controlling eiiect persisting after the train has moved beyond the controlling point.

After a controlling or tripping opera- For resetting the relay F, I preferably provide a reset partial circuit including the con ductor 57 and a contact 58' arranged in paralconditions will pass a clear lel with the contact 25, the contact 58 being controlled by an indication receiver F which may be of the two-element type having a field f always energized from the vehicle carried generator G and connected thereto by means of the conductors 59 and 60 connected to the lines 19 and 11 respectively, and an armature f included in a circuit which may be designated as 0 comprising the armature f conductor 61, coil of a vehicle carried inductor (Z and conductor 62., the said inductor (Z being arranged to move over the roadside inductor element (Z' heretofore mentioned. F or resetting the relay H, 1 preferably provide a resetting partial circuit comprising a conductor 63, conductor G l, contact 65, conductor 66 and conductor 67, this partial circuit being arranged in parallel With the stick contact 86 of the relay H, the contact being controlled by an indication receiver H which may also be of the two-element type having the field h energized from the generator G and connected thereto by means of the conductors 68 and 69, and the armature h arranged in a circuit which may be designated as 29 comprising the armature h conductor 7 O, coil of a vehicle carried inductor element 0 and conductor 71, the inductor element a being arranged to move over the roadside inductor element 6 heretofore men tioned.

The operation of the resetting means is substantially as follows: After the vehicle carried relay F has been tripped in response to either danger or caution roadside conditions, the said relay F is reset when the vehicle passes a station indicating clear conditions ahead by the closing of the contact 58 which efiects the closing of the vehicle circuit 2'. Under such clear track conditions the roadside inductor circuit m is closed and when the vehicle inductor means moves over the roadside inductor means, the vehicle inductor a energizes the roadside inductor a, inductor element a acting now in the nature of an impulse receiving inductor, the impulse being transmitted to the roadside inductor element d which in turn transmits the same to the vehicle receiving inductor (Z. The impulse received by the vehicle receiving inductor (Z is sufllcient to energize the relay element F for operating the relay F to close the contact 58 of the reset circuit. It will be noted that the closing of the roadside inductor circuit m obviates any change taking place in the resonant vehicle circuit 2', so that the closing of the contact 58 of the reset partial circuit effects the energization of the relay F by the cooperation of inductor'elements a, Z) for the closing of the contacts of this relay. Although the cooperation of the reset inductors (Z and (Z is but momentary, it will be noted that the energizing of the relay F closes the contact 25, thereby closing the stick or holding circuit for the said relay F.

When a train reaches a station indicating caution, the relay H is reset by the closing of the contact 65, the closing. of this contact eflecting the closing of the vehicle carried circuit Z. Under such caution conditions the roadside inductor circuit 92 is closed as hereinbefore pointed out, and when the vehicle inductor elements move over the road side inductor elemen s, the vehicle induct-or element (a energizes the roadside inductor element (4, the latter acting in the nature of an impulse receiving inductor, the received impulse energizing the transmitting inductor e for producing an impulse which in turn is transmitted to the vehicle receiving inductor e, the said transmitted impulse being Sullicient for energizing the relay element 7& of the relay H, the energization of this relay effecting the closing of the reset circuit contact 65. It will a ain here be noted that due to the closing of too roadsideinductor circuit n the resonance of the vehicle carried circuit Z is not disturbed under the conditions described, and that therefore the vehicle carried element 0 receives sufficient energy from the energizing element a to operate the relay H when the contact 65 is closed. It will be also noted that even though the cooperation between the resetting inductors e and e is but momentary, the relay H remains energizet when the vehicle passes the control point due to the closing of the stick contact 36 of the circuit Z when the relay H is energized.

Under danger track conditions due to the deenergization of both the roadside inductor circuits m and 91, both relays F and H are deenergized and the valve V is operated to bring the vehicle to a halt. For the purpose of permitting the train to proceed after thus being brought to a halt, there may be provided a manually reset circuit which includes the conductor 78, the switch 74 and the conductor 75 arranged in parallel with the reset contact 65, the closing of the switch 74 effecting the closing of the vehicle carried circuit Z, this to permit the train to proceed under restriction to the next control station.

Although in the embodiment illustrated in the drawings and hereinbefore described, the vehicle carried and roadside inductor means are designed to cooperate for producing clear, caution and danger indications on the train, it will be understood that the principles of my invention may be employed for producing any number oftrain indications. For example, the inductive system may consist merely in the combination of inductors for producing proceed and stop effects on the train mechanism. With such a construction the inductors a, b and (Z cooperating with the inductors a, b and (Z would be employed, the roadside inductors functioning for influencing the vehicle inductors to produce a controlling condition and for being influenced by the vehicle inductors for producing a modification of the controlling condition, a single inductor circuit on the roadside being thus employed for producing the trip sing effect and the resetting efiect.

Referri g now to F 2 of the drawings, 1 show meas ar plifying the current iny received by the rehicle carried in ductors (Z and c,'the said means comprising generators designated'generally as G and G generator G being inserted in the circuit p and generator G in the circuit '0. Each generator may be oi one induction motor type, the generator G having the rotor 77 and the field 78, and generator G having the rotor and the field 78. In each generator the l rotor is driven by a motor (not shown) which may for example be a turbine. With the train control system in operation, the rotors of these generators are continuously operated, and whenever-the inductors (Z and 6 become energized bytheir corresponding track inductors, energy is induced in the windings or stators of the generators, with the result t at in effect the amplification takes place for the moment, considerably increas-' ing the amount of energy through the armatures f and li of the indication receivers F and H.

Referring now to Fig, 3 of the drawings, I show amodification of the amplifying means employed in the inductor circuits g9 and 0, each inductor circuit being provided with a generator which maybe of the direct current type, the circuit 10 being provided with. the generatorGr and the circuit 0 being provided with the generator G It will be noted that the circuit including the inductor 6 includes theconductor Y9, condenser 80, winding 81 of the field pole 82, conductor 83, winding 84: of the field pole 85, and con' ductor 86. The armature 7&4 of the indication receiver H includes in its circuit conductor 87, condenser 88, conductor 89, winding 90 on the field pole 82, conductor 91, armature 92, conductor 93, winding 94 on the field pole S5, and conductor95; It will be noted fromthis construction that the armature of the indication receiver cooperates with its inductor, but that the circuits connectingthe two are separated. The genera tor G comprises similar parts designated by primed reference characters. The condensers in the inductor parts of the circuits as well as inthe-armature parts of the-circuits are provided for correction of power factor of the circuits, these condensers being preferably adjusted so as to place the circuits in the proper state oi impedance. hen the inductors (Z- and e or either of them come into correspondence with their respective cooperating track inductors, as for example when the inductor 6 comes into correspondence with the track inductor e, energy is induced in the inductor 6', this in turn energizing the field" of the generator G momentarily, and

since the generatorG is operating as a generator, flux is set up in the field of the generator and a current is produced in the circuit 39 of the armature 92, with the result that the energy which was originally induced in the inductor e is magnified in its eiiect on the circuit 39.

The operation of my train control system as whole is substantially as follows: When the train is running without restriction, the vehicle carried relay F is in an energized state and the vehicle carried relay H is in a deenergized state with the valve magnet 1O energized to permit the train to proceed without limitation. When the train running without restriction reaches a control station indicating clear, the vehicle carried inductor means h is uninfiuenced by the roadside inductor means B and the relay F remains in an energized state. When such a train running without restriction reaches a control station indicating caution, the train carried inductor means A cooperates with the roadside inductor means B to produce a deenergizing of the vehicle carried relay F and an energizing of the vehicle carried relay lithe valve magnet 10 being thereby placed under the control of the speed con troller 21 to permit the train to proceed under a speed restriction, the speed control circuit comprising the generator G, conductors 19, 18 and 17 electromagnet l0, conductors 16 and 24, a contact 23, conductor 22, speed controller 21, and conductors 20, 12 and 11. When, however, a. train running without re striction reaches a station indicating dan ger, the vehicle carried inductor means A cooperates with the roadside inductor means B to deenergize the relay F, and since the relay H is in a deenergized state, the train control circuit 71 will be opened to deenergize the electromagnet 10 for bringing the vehicle to a halt, after which the switch 74 may be operated to permi the train to proceed to the next control station under a speed restriction. When atrain is running under caution conditions, the vehicle carried relay Fis in a deenergized state and the vehicle carried relay H is in an energized state. l/Vhen the train which is running under such a caution restriction reaches a control station indicating caution, the roadside inductor means B has no influence on thevehicle carried inductor means A, and the relay H remains energized .to maintain the speed restrictivecontrolof the train. When, however,=a train running under a speed restriction reaches a station indicating danger, the vehicle carried inductor means A cooperates with the roadside inductor means B to trip or deenergize the relay H, and since the relay F is in a de'energized state, the control circuit 'w'illbe opened to deenerg-ize the magnet 10 to bring the vehicle to a halt, after which the switch 74 must be operated to pen mit the train to proceed under restriction to the next control station.

While I have shown my invention in the preferred form, it will be obvious that many changes and modifications may be made in the structure disclosed without departing from the spirit of the invention, defined in the following claims.

I claim:

1. In combination, vehicle carried mechanism, a vehicle carried inductor means including an energizing inductor associated with and adapted to be influenced for tripping the said vehicle carried mechanism. a second vehicle carried inductor means including an energy receiving inductor associated with and adapted to be influenced for resetting the vehicle carried mechanism, and a roadside inductor circuit embracing an inductor means cooperating with said vehicle carried inductor means, said roadside inductor circuit being operable in response to a given roadside condition for influencing the first aentioned vehicle carried inductor means to produce the tripping action and o erable in response to another roadside condition for influencing the second vehicle carried inductor means to produce the resetting action.

2. In combination, vehicle carried mechanism, a vehicle carried inductor means including an energizing inductor associated with and adapted to be influenced for tripping the said vehicle carried mechanism, a second vehicle carried inductor means including an energy receiving inductor associated with and adapted to be influenced for resetting the vehicle carried mechanism, and a roadside inductor circuitembracing a plurality of inductors spaced in correspondence with the rehicle carried inductors, said circuit being operable in response to a given roadside condition for influencing the first mentioned vehicle carried inductor means to produce the tripping action and operable in response to another roadside condition for influencing the second vehicle carried inductor means to producethe resetting action.

3. In combination, vehicle carried mecha nism, a vehicle carried inductor means associated with and adapted to be influenced for tripping the said vehicle carried mechanism, a second vehicle carried inductor means associated with and adapted to be influenced for resetting the vehicle carried mechanism, and roadside means including an inductor and a circuit'embracing the inductor, said circuit being operable in response to a given roadside condition for influencing the first mentioned vehicle carried inductor means to produce the tripping action and operable in response to another roadside condition or influencing the second vehicle carried inductor means to produce the resetting action.

4. In combination, vehicle'carried mechanism, a vehicle carried inductor means associated with and adapted to be influenced tor tripping the said vehicle carried mechanism, a second vehicle carried inductor means associated with and adapted to be influenced for resetting the vehicle carried mechanism, and a roadside means including a plurality of inductors and a circuit embracing the plurality of inductors, said circuit being operable when open for influencing the first mentioned vehicle carried inductor means to produce the tripping action and operable when closed for influencing the second vehicle carried inductor means to produce the resetting action.

5. In combination, vehicle carried mechanism, a vehicle carried energizing inductor associated with and adapted to be influenced for tripping the said vehicle carried mechanism, a second vehicle carried inductor associated with and adapted to be influenced for resetting the vehicle carried mechanism, and a roadside inductor means operable in response'to a given roadside condition for influencing the energizing vehicle carried inductor to produce the tripping action and operable in response to another roadside condition for being energized by said energizing inductor for influencing the second vehicle carried inductor to produce the resetting action.

6. In combination. Vehicle carried mechanism, a vehicle carried energizing inductor associated with and adapted to be influenced for tripping the said vehicle carried mechanism, a vehicle carried source of energy for said inductor, a second vehicle carried in ductor associated with and adapted to be influenced for resetting the vehicle carried mechanism, and a roadside. inductor means operable in response to a given roadside condition for influencing the energizing vehicle carried inductor to produce the tripping ac tion. and operable in response to another roadside condition for being energized by said energizing inductor for influencing the second vehicle carried inductor means to produce the resetting action.

7 In combination, vehicle carried mechanism including a normally closed operating circuit, a vehicle carried inductor means associated with and adapted to be influenced for opening the said circuit, a secondvehicle carried inductor means associated with and adapted to be influenced for closing said cir cuit, and a roadside inductor circuit embrac ing an inductor means cooperating with said. vehicle carried inductor means, said roadside inductor circuit being operable in re sponse to a given roadside condition for influencing the first mentioned vehicle carried inductor means and operable in response to another roadside condition for influencing the second vehicle carried inductor means.-

8. In combination, vehicle carried mechanism includinga normally closedcircuit, a

saidoperation of the vehicle can vehicle carried inductor means associated with and adapted to be influenced forc ing the said-circuit, a second vehl ca inductor means associated with and a lap to he influenced for closingthe s id cir' and a roadside means comprisin a i of inductors and circuit embraci rality oi inductors 'operahle'ivhen influencing the first mentioned ve' ried inductor means and operable closed for influencing the-secondvehicl ried inductor means.

9. In combination, vehicle carried mechanism, a vehicle carried inductor meansassociated with and adapted to be influenced for producing a predetermined operation inthe said vehicle carriedmechanism a second vchicle carried inductor means associated with and adapted to'be influenced for modifying ied mechanism, and a roadside inductor circuit embrao ing an inductor means cooperating with said vehicle carried inductor means. said roadside inductor circuit being operable in respol r to a given roadside condition for influenci i the said first mentioned vehicle carried inductor means and operable in response to another roadside condition for influe 11g the second vehiclecarried inductor means,

10. In combination vehicle carri d mechanism, vehicle carriedenergizing inductor associated Withand adapted to he influcnc for producing a predeterminedoperation the said vehicle carried mechanism, seco vehicle carried inductor associated. Witha adapted to be influenced for modifying; operation of the vehicle carried/mechani I and .a roadside inductor meansaoperahle ,4 response to: a given road ide condit influencing the energizing" vehicle 1 ductor and operable in respo roadside condition for bein g 1 said energizing inductor for, influencing 1 Second vehicle carriedinductorn 11. In ombination vehicle carried mechanism, a vehicle carried inductor associated Withand adapted-tobeinflncnced for producing a predetermined rope-ration the said vehicle carried mechanism a, second vehicle carried inductor means associated-Win11 and adapted to. he influenced formcdifvlng said operation of the vehicle carried mecha nism, and a roadside inductor circuit nbrac inn an inductor means cooperating with said d othe vehicle carried inductor men roadside inductor circuit being operable in response to a danger roadside condition for innucncu a the said first mentioned vehicle carried i.-. ductor means and operable in responseto safe roadside conditionfor. influenc' q, th second vehicle carried inductor me i 12. In combination vehicle car nism, a vehicle carried inductor means asso-; ciated with and adapted to-be influenced for. producing a predeterminedoperation inthc:

said vehicle carried inductor means,

saidvehicle carried mechanism a secondvehicle carried inductor means associated with .nism; and a roadside inductor circuit vem- With bracing an inductor means cooperating vid roadside inductor circuit being operable in response to a caution roadside-cond on for influencing the said first mentioned vehicle carried inductor means and operable in response to a safe roadside condition for influencing the-second vehicle carried inductor means.

13'; 'IIl'COIIlblIlfiiZ-iOIl, vehiclecarried mechanism, a vehicle carried inductor means'ineluding an energizing, inductor associated With and adapted to be influenced for-tripping the said vehicle carried .mechanism; a second vehicle carried inductor means, in.- cluding an energy receiving inductor assocr ated'with and adapted to be-influenced for resetting thevehicle carried mechanismand a roadside inductorium means operable, in response to a given roadsidecondition-tor influencing the firstwmentioned inductor means to produce the tripping actionand operable in response to another roadside condition for influencing the secondvehicle-carried inductor meansto produce the resetting action hen-the vehicle; carriedvmechanism has been'tripped andbeing: inoperative under such lastmentioned condition for producing any change in said vehicle carried mechanism when the said vehicle carried mechanism has not beentripped.

7 14. In combinatiom vehicle carried mechanism, a vehicle carriedenergizing inductor associated. with and adaptedtestis-influenced for tripping the said vehicle carried-mechanisnna second vehicle carried inductorassociatedwith andadapted to-be influenced'ior resettingthe vehicle carriedmechanism and a l roadside inductorium; means operable in response to a: given roadside conditionc'for influencing the first mentioned inductor 'to produce the tripping action and operable in response to anotherrcadside condition for fortripping the; said vehicle carried mechanism,

second vehicl'ewcarriedi inductor means associated Withs and adapted to'be influenced for resetting the" veh-icleca'rried echanism and a ro'adside meansnincludinga spaced inductors, and a circuit embracing the spaced inductors, operable in response to a given roadside condition for influencing the first mentioned inductor means to pro duce the tripping action and operable in response to another roadside condition for influencing the second vehicle carried inductor means to'produce the resetting action when the vehicle ca ried mechanism has been tripped and being inoperative under such last mentioned condition for producing any change in said vehicle carried mechanism When the said vehicle carried mechanism has not been tripped.

16. In combination, vehicle carried mechanism, a vehicle carried inductor means associated with and adapted to be influenced for tripping the said vehicle carried mechanism, a second vehicle carried inductor means associated with and adapted to be influenced for resetting the vehicle carried mechanism; and a roadside means including a plurality of inductors, and a circuit embracing the plurality of inductors operable when open for influencing the first mentioned inductor means to produce the tripping action and operable when closed for influencing the second vehicle carried inductor means to produce the resetting action when the vehicle carried mechanism has been tripped and being inoperative when closed for producing any change in said vehicle carried mechanism when the said vehicle carried mechanism has not been tripped.

17. In combination, vehicle carried mechanism comprising a control relay, a circuit therefor and an inductor in said circuit adapted to be influenced for producing a predetermined operation of said relay, a resetting circuit for said relay, an indication receiver for operating the resetting circuit and a second inductor adapted to be in fiuenced for operating the indication receiver; and roadside mechanism comprising a roadside inductor, and circuit governing the same operable in response to a given roadside condition for influencing said first mentioned vehicle carried inductor and operable in response to another roadside condition for influencing the second vehicle carried inductor.

18. In combination, vehicle carried mechanism comprising a control relay, a transformer including primary and secondary coils associated therewith, the said primary coil being adapted to be influenced for producing a predetermined operation of said relay, a resetting circuit for said relay, an indication receiver for operating the resetting circuit and an inductor adapted to be influenced for operating the indication receiver; and roadside mechanism comprising a roadside inductor, and a circuit for said inductor operable in response to a given roadside condition for directly influencing said primary coil and operable in response to another roadside condition for influencing the said vehicle carried inductor.

19. In combination, vehicle carried mechanism comprising a control relay, a trans former including primary and secondary coils associated therewith, the said primary coil being adapted to be influenced for producing a predetermined operation of said relay, a resetting circuit for said relay, an indication receiver for operating the resetting circuit and an inductor adapted to be influenced for operating the indication receiver; and roadside mechanism comprising a roadside inductor means operable in response to a given roadside condition for influencing said primary coil and operable in response to. another roadside condition for being energized by said primary coil for influencing the said vehicle carried inductor.

20. In combination, vehicle carried mechanism comprising a control relay, a circuit therefor and an inductor in said circuit adapted to be influenced for producing a predetermined operation of said relay, a resetting circuit for said relay, an indication receiver for operating the resetting circuit and a second inductor adapted to be influenced for operating the indication receiver:v and roadside mechanism comprising inductor means, and a roadside circuit embracing the inductor means operable when open for influencing said first mentioned vehicle carried inductor and operable 'whenclosedrfor influencing the second vehicle carried inductor.

21. In combination, vehicle carried mechanism comprising a control relay, a. normally closed circuit therefor and an inductor in said circuit adaptedto be influenced for opening the circuit to trip said relay, a resetting circuit for said relay, an indication receiver for operatng the resetting circuit and a second inductor adapted to be influenced for operating the indication receiver; and roadside mechanism comprising acombined tripping and resetting inductor means combined in one circuit and operable in response to a given roadside condition for influencing said first mentioned vehicle carried inductor and operable in response to another roadside condition for influencing the second vehicle carried inductor.

22. In combination, vehicle carried mechanism comprising a control relay, a normally closed stick circuit therefor and an inductor in said circuit adapted to be influenced for opening the circuit to trip said relay, a resetting circuit for said relay, an indication receiver for operating .the resetting circuit and a second indicator adapted to be influ enced for operating the indication receiver:

and roadside mechanism comprising a road- 7 side inductor means and a normally closed circuit therefor operable when open for influencing said first mentioned vehicle carried inductor and operable when closed for influencing the second vehicle carried inductor.

23. In combination, vehicle carried mechanism selectively operable for producing different train control eflects, a vehicle carried inductor means associated with and adapted to beinfluenced for tripping the said vehicle carried mechanism, a second vehicle carried inductor means associated with and adapted to be selectively influenced for resetting the vehicle carried-mechanism, and a mechanism comprising a combined tripping and resetting inductor means combined in one circuit and operable in response to a given roadside condition for influencing the first mentioned vehicle carried'inductor means to produce the tripping action andselectively operable in response to either of two other roadside conditions for selectively influencing the second vehicle carried inductor means to produce the selective resetting action.

24. In combination, vehicle carried mechanism selectively operable for producing diflerent train control eflects, a vehicle carried inductor means associated with and adapted to be influenced for tripping the said vehicle carried mechanism, a second vehicle carried inductor means including a plurality of impulse receiving inductors associated with and adaptedto be selectively influenced for resetting the vehicle carried mechanism, and a roadside inductor means including a plurality of impulse transmitting inductors operable in response to a given roadside condition for influencing the first mentioned vehicle carried inductor means to produce the tripping action and selectively operable in response to either of two other roadside conditionsfor selectively influencing the second vehicle carried inductor means to produce the selective resetting action.

25. In combination, vehicle carried mechanism selectively operable for producing different train control eiiects, a vehicle carried inductor means associated with and adapted to be influenced for tripping the said vehicle carried mechanism, a second vehicle carried inductor means associated with and adapted to be selectively influenced for resetting the vehicle carried mechanism, and roadside means including an inductor circuit operab e in response to a given roadside condition for influencing the first mentioned vehicle car ried inductor means to produce the tripping action and selectively operable in response to either of two other roadside conditions for selectively influencing the second vehicle carried inductor means to produce the selective resetting action. 7

26. In combination, vehicle carried mechanism selectively operable for producing different train control effects, a vehicle carried inductor means associated with and adapted to be influenced for tripping the said vehiclev carried mechanism, a second vehicle carried inductor means associated'with and adapted to be selectively influenced for resetting the vehicle carried mechanism, and a roadside means including a circuit-having an impulse receiving inductor and a plurality of impulse transmitting inductors operable in response to a given roadside condition for'influencing thefirst mentioned vehicle carried inductor means to produce the tripping action and selectively operable in response to either of two other roadside conditions for selectively influencing the second vehicle can ried inductor means to resetting action.

27. In combination, vehicle carried mechanism selectively operable for producingdifferent train control eflects, a vehicle carried energizing inductor associated with and adapted to be influenced for tripping the said vehicle carried mechanism, a second vehicle carried inductor means associated with and adapted to be selectively influenced for resetting the vehicle carried mechanism, and a roadside inductor means operable in response to a given roadside condition forinfluencing the energizing vehicle carried inductor to produce the tripping action and selectively operable in response to either of two other roadside conditions for being energized by said energizing inductor for selectively. influencing the second vehicle carried inductor means to produce the selective resetting action.

28. In combination, vehicle carried mechanism selectively operable for producing different train control effects, a vehicle carried inductor means associated with and adapted to be influenced for tripping the said vehicle carried mechanism, a secondvehicle carried inductor means associated with and adapted to be selectively influenced for resetting the vehicle carried mechanism, and a roadside inductor means including a receiving inductor, two transmitting inductors and changeable circuit connections therebetween operable in response to a given roadside condition for influencing the first mentioned vehicle carried inductor means to produce the tripping action and selectively operable in response to either of two other roadside conditions for selectively influencing the second vehicle carried inductor means to produce the selective resetting action.

produce the selective 29. In combination, vehicle carried mechanism including a plurality of circuits selectively closable for producing different train control effects, a vehicle carried inductor means associated with and adapted to be influenced for opening either of the closable circuits, a second vehicle carried inductor means associated'with and adapted to be influenced for selectively resetting the circuits, and a roadside inductor means operable in response to a given roadside condition for influencing the first mentioned vehicle carried inductor means and selectively operable in response to either of two other roadside conditions for selectively influencing the second vehicle carried inductor means.

30. In combination, vehicle carried mechanism including a plurality of circuits selectively closable for producing difl'erent train control effects, a vehicle carried inductor means associated with and adapted to be influenced for opening either of the closable able for producing different train control et-' fects comprising a vehicle carried control relay mechanism, circuit means therefor, an inductor in said circuit means adapted to be influenced for producing a predetermined operation of said relay mechanism, resetting circuits for said relay mechanism, an indication receiver means selectively operable for operating said reset circuits and a plurality of vehicle carried inductors for said indication receiver means, and roadside mechanism comprising a roadside inductor means operable in response to a given roadside condition for influencing said first mentioned vehicle carried inductor and operable in response to either of two other roadside conditions for selectively influencing the said plurality of vehicle carried inductors.

32. In an inductive train control system, vehicle carried mechanism selectively operable for producing diflerent train control effects comprising a vehicle carried control relay mechanism, a transformer including primary and secondary coils associated therewith, the said primary coil being adapted to be influenced for producing a predetermined operation of said relay mechanism, resetting circuits for said relay mechanism, an indication receiver means selectively operable for operating said reset circuits and a plurality of vehicle carried inductors for said indication receiver means; and roadside mechanism comprising a roadside inductor means operable in response to a given roadside condition for influencing said primary coil and operable in response to either of two other roadside conditions for selectively influencing the said plurality of vehicle carried inductors.

33. In an inductive train control system,

vehicle carried mechanism selectively operable for producing difl'erent train control effects comprising a vehicle carried control relay mechanism, a transformer including primary and secondary coils associated therewith, the said primary coil being adapted to be influenced for producing a prede termined operation of said relay mechanism, resetting circuits for said relay mechanism, an indication receiver means selectively operable for operating said reset circuits and a plurality of vehicle carried inductors for said indication receiver means; and roadside mechanism comprising a roadside inductor means operable in response to a given roadside condition for influencing said primary coil and operable in response to either of two other roadside conditions for being energized by said primary coil for selectively influencing the said plurality of vehicle carried inductors.

84. In an inductive train control system, vehicle carried mechanism selectively operable for producing diflerent train control eflects comprising a plurality of vehicle carried control relays, a circuit for each relay, and inductor in each. circuit, an energizing inductor common to both circuits adapted to be influenced for producing a predetermined operation of either relay, a plurality of resetting circuits one tor each relay, an indication receiver for each reset circuit and a vehicle carried inductor for each indication receiver; and roadside mechanism comprising a roadside inductor means operable in response to a given roadside condition for influencing said energizing inductor and operable in response to either of two other roadside conditions for selectively influencing the other vehicle carried inductors.

35. In an inductive train control system, vehicle carried mechanism selectively operable for producing different train control effects comprising a plurality of vehicle carried control relays, a circuit for each relay, an inductor in each circuit, an energizing inductor common to both circuits adapted to be influenced for producing a predetermined operation of either relay, a plurality of resetting circuits one for each relay, an indication receiver for each reset circuit and a vehicle can ried inductor for each indication receiver; and roadside mechanism comprising an inductor for each indication receiver; and roadside mechanism comprising an inductor arranged to receive energy from the vehicle energizing inductor, a plurality of inductors arranged to transmit energy to said vehicle carried inductors, and changeable circuit connections between said roadside inductors.

36. In an inductive train control system, vehicle carried mechanism selectively operable for producing diflerent train control effects comprising a plurality of vehicle carried control relays, a circuit for each relay,

an inductor in each circuit, an energizing inductor common to both circuits adapted to be influenced for roducing a predetermined operation of either relay, a plurality of resetting circuits one for each relay, an indication receiver for each reset circuit and a vehicle carried inductor for each indication receiver; and roadside mechanism comprising an inductor arranged to correspond with said vehicle carried energizing inductor, a plurality of inductors arranged to correspond with the other vehicle inductors, circuit means connecting the roadside inductors and means for breaking and changing circuit connections between the roadside inductors.

37. In combination, vehicle carried mechanism, a vehicle carried inductor means associated with and adapted to be influenced for tripping and for resetting the said vehicle carried mechanism, said vehicle carried inductor means including an energizing inductor; and a roadside inductor means cooperating with said vehicle carried inductor means, said roadside inductor means including a roadside inductor element devoid of an energy source cooperable directly with said energizing inductor in response to a given roadside condition for producing the tripping action and cooperable directly with said energizing inductor in response to another roadside condition for producing the resetting action of said vehicle carried mechanism.

38. In combination, vehicle carried mechanism, a vehicle carried inductor means associated with and adapted to be influenced for tripping and for resetting the said vehicle carried mechanism, said vehicle carried inductor means including an energizing inductor and an energy receiving inductor cou pled thereto; and a roadside inductor means cooperating with said vehicle carried inductor means, said roadside inductor means including a roadside inductor element cooperable with said energizing inductor in response to a given roadside condition for producing the tripping action and cooperable with said energizing inductor in responseto another roadside condition for producing the resetting action of said vehicle carried mechanism.

39. In combination, vehicle carried mechanism, a vehicle carried inductor means associated'with and adapted to be influenced for tripping and for resetting the said vehicle carried mechanism, said vehicle carried inductor means including an energizing inductor; and a roadside inductor means cooperating with said vehicle carried inductor means, said roadside inductor means including a circuit devoid of an energy source and a roadside inductor element in said circuit cooperable with said energizing inductor in response to a given roadside condition for producing the tripping action and cooperable with said energizing inductor in response to another roadside condition for producing the resetting action of said vehicle carried mechanism.

40. In combination, vehicle carried mechanism, a vehicle carried inductor means associated with and adapted to be influenced for tripping and for resetting the said vehicle carried mechanism, said vehicle carried inductor means including an energizing inductor, and an A. C. source of energy therefor; and a roadside inductor means cooperating with said vehicle carried inductor means, said roadside inductor means including a roadside inductor element cooperable with said energizing inductor in response to a given roadside condition for producing the tripping action and cooperable with said energizing inductor in response to another roadside condition for producing the resetting action of said vehicle carried mechanism.

d1. In combination, vehicle carried mechanism, a vehicle carried inductor means associated withan adapted to be influenced for tripping and for reset-ting the said vehicle carried mechanism, said vehicle carried inductor means including an energizing inductor; and a roadside inductor means cooperating with said vehicle carried inductor means, said roadside inductor means including a circuit devoid of an energy source and a. roadside inductor element in said circuit cooperable with said energizing inductor in response to a given roadside condition for producing the tripping action of said vehicle carried mechanism when said circuit is open and cooperable with said energizing inductor in response to another roadside condition for producing the resetting action of said vehicle carried mechanism when said circuit is closed.

42. In combination, vehicle carried mechanism, a vehicle carried inductor means associated with and adapted to be influenced for tripping and for resetting the said vehicle carried mechanism, said vehicle carried inductor means including energizing inductor, an energy receiving inductor coupled thereto and an A. C. energy source therefor; and a roadside inductor means cooperating with said vehicle carried inductor means, said roadside inductor means including a roadside inductor element cooperable with said energizing inductor in response to a given road side condition for producing the tripping action and cooperable with said energizng inductor in response to another roadside condition for producing the resetting action of said vehicle carried mechanism.

43. In a train control system, a normally energized vehicle carried element supplied with A. 0., a roadside element inductively associated with the vehicle element, a train con trol phase relay controlled by the power factor of the vehicle element, and a holding means for the phase relay releasable by coaction of the vehicle and roadside elements.

44. In a train control system, a normally energized vehicle carried element supplied with A. 6., a roadside element inductively associated with the vehicl element, a train control phase relay controlled by the power factor of the vehicle element, and a holding means for the phase relay releasable by variation of the magnetic characteristics of the vehicle element.

45. In a train control system, a phase relay, a holding means for the relay, vehicle carried coils normally energized and controlling respectively the relay and the holding means, and roadside means, inductively associated With the vehicle means, to vary the control by the vehicle means.

l6. An intermittent inductive train control system comprising in combination, vehicle carried mechanism including inductively coupled elements normally coupled together for direct energy transference therebetiveen, a circuit for the vehicle carried mechanism controlled by said coupled elements, said circuit having a normal impedance such as to normally permit energization of the circuit, and roadside mechanism including roadside inductor cooperating inductively with the vehicle carried inductively coupled elements when said elements move over and in proximity to said roadside inductor in the movement of the vehicle over the roadside for changing the impedance of said controlled circuit to effectively deenergize the circuit and to produce an operation in said vehicle carried mechanism.

47. An intermittent inductive train control system comprising in combination, vehicle carried mechanism including inductively coupled elements normally coupled together for direct energy transference therebetween, anormally resonant circuit for the vehicle carried mechanism controlled by said coupled elements, and roadside mechanism including a roadside inductor cooperating inductively With the vehicle carried inductively coupled element when said elements move over and in proximity to said roadside inductor in the movement of the vehicle over the roadside for making said controlled circuit non-resonant to produce an operation in said vehicle carried mechanism.

48. An intermittent inductive train control system comprising in combination, vehicle carried mechanism including inductively coupled coils normally coupled together for direct energy transference therebetween, a circuit for the vehicle carried mechanism having a normally low imp-edance controlled by said coupled coils, and roadside mechanism including a roadside inductor cooperating inductively with the vehicle carried inductively coupled coils when said coils move over and in proximity to said roadside inductor in the movement of the vehicle over the roadside for increasing the impedance of said controlled circuit to produce a tripping operation in said vehicle carried mechanism, and a roadside circuit for said roadside inductor operative When closed to prevent the said tripping operation thereof.

49. An intermittent inductive train control system comprising in combination, vehicle carried mechanism including a source of energy, a train controlling device, an energy transmitting coil connected to said source of energy, an energy receiving coil normally inductively coupled to said energy transmitting coil for receivin energy therefrom and connected in circuit to said controlling device, said circuit having means for predetermining the impedance of the circuit to permit energization of said circuit, and roadside mechanism including an inductor member cooperating inductively With the vehicle carried energy transmitting and receiving coils When said coils move over and in proximity to said inductor member for changing the impedance of said vehicle carried circuit to effectively deenergize the circuit so as to operate the vehicle carried mechamsm.

50. An intermittent inductive train control system comprising in combination, vehicle carried mechanism including a source of energy, a train controlling device, an energy transmitting coil connected to said source of energy, an energy receiving coil normally inductively coupled to said energy transmitting coil for receiving energy therefrom and connected in circuit to said controlling device, said circuit having means for rendering the same normally resonant, and roadside mechanism including an inductor member cooperating inductively With the vehicle carried energy transmitting and receiving coils When said coils move over and in proximity to said inductor member for changing the resonance characteristics of said vehicle carried circuit to operate the vehicle carried mechanism.

51. An intermittent inductive train control system com'prisingin combination, vehicle carried mechanism including a. source of energy, a. train controlling device, an en ergy transmitting coil connected to said- .source of energy, an energy receiving coil normally inductively coupled to said energy transmitting coil for receiving energy therefrom and. connected in circuit to said controlling device, said circuit having means for predetermining the impedance of the circuit to permit normal energization of the circuit, and roadside mechanism including an inductor member cooperating inductively With the vehicle carried energy transmitting and receiving coils when said coils move over and in proximity to said inductor member for increasing the impedance of said vehicle carried circuit to trip the vehicle carried mechanism, and a circuit for said roadside inductor member for inhibiting the tripping operation thereof.

52. An intermittent inductive train c011- trol system comprising in combination, vehicle carried mechanism including a source of energy, a train controlling device, an en ergy transmitting coil connected to said source of energy, an energy receiving coil normally inductively coupled to said energy transmitting coil for receiving energy therefrom and connected in circuit to said controlling device, said circuit having means for predetermining the impedance of the circuit, and roadside mechanism including an inductor member cooperating inductively with the vehicle carried energy transmitting and receiving coils when said coils move over and in proximity to said inductor member for changing the impedance of said vehicle carried circuit to trip the vehicle carried mechanism; and means for resetting said mechanism energized from said vehicle carried energy transmitting coil.

53. An intermittent inductive train control system comprising in combination, vehicle carried mechanism including a source of energy, a train controlling device, an energy transmitting coil connected to said source of energy, an energy receiving coil normally inductively coupled to said energy transmitting coil for receiving energy therefrom and connected in circuit to said controlling device, said circuit having means for rendering the same normally resonant, and roadside mechanism including an inductor member cooperating inductively with the vehicle carried energy transmitting and receiving coils when said coils move over and in proximity to said inductor member for changing the resonance characteristics of said vehicle carried circuit to trip the vehicle carried mechanism, and a circuit for said roadside inductor member embodying means for correcting the impedance factor thereof and operable when closed for inhibiting the tripping operation of the roadside inductor member.

54. An intermittent inductive train control system comprising in combination, vehicle carried mechanism including inductively coupled coils normally coupled together for direct energy transference therebetween, a circuit for the vehicle carried mechanism controlled by said coupled coils, said circuit having means for predetermining the impedance thereof, and roadside mechanism including a pair of roadside inductor elements arranged to correspond with the vehicle carried coils and operable when the said coils move over said inductor elements for changing the impedance of said controlled circuit, and a roadside circuit including coils for said roadside inductor ele-- ments, said roadside circuit when closed inhibiting the impedance-changing operatlon of said inductor elements.

55. An intermittent inductive train control system comprising in combination, vehicle carried mechanism including inductively coupled coils normally coupled together for direct energy transference therebetween, a circuit for the vehicle carried mechanism controlled by said coupled coils, said circuit having means for making the same normally resonant, and roadside mechanism including a pair of roadside inductor elements arranged to correspond with the vehicle carried coils and operable when the said coils move over said inductor elements for changing the resonance characteristics of said controlled circuit, and a roadside circuit including coils for said roadside inductor elements, said roadside circuit when closed inhibiting the resonance changing operation of said inductor elements.

56. An intermittent inductive train control system comprising in combination, vehicle carried mechanism including inductively coupled coils normally coupled together for direct energy transference therebetween, a circuit for the vehicle carried mechanism controlled by said coupled coils, said circuit having capacity and inductance components, and roadside mechanism including a pair of roadside inductor elements arran ed to correspond with the vehicle carried coils, and a roadside circuit including coils for said roadside inductor elements, said roadside circuit also having capacity and inductance components.

57. An intermittent inductive train co-ntrol system comprising in combination, vehicle carried mechanism including inductively coupled coils normally coupled together for direct energy transference therebetween, a circuit for the vehicle carried mechanism controlled by said coupled coils, said circuit having means for predetermining the impedance thereof, and roadside mechanism including a pair of roadside inductor elements arranged to correspond with the vehicle carried coils and operable when the said coils move over said inductor elements for changing the impedance of said controlled circuit to trip the same, a roadside circuit including coils for said roadside inductor elements, said roadside circuit when closed inhibiting the impedancechanging and tripping operation of said inductor elements, and vehicle carried and roadside inductor means energizable from said vehicle carried coupled coils for resetting said mechanism.

Signed at Niagara Falls, in the county of Niagara and State of New York, this 18th day of April, A. D. 1928.

FRED M. ROSENZWEIG.

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