US1749234A - Automatic train control - Google Patents

Description

March 4, 1930. P J'-s1MMEN 1,749,234

vAUTOMATIC TRAIN CONTROL Original Filed Feb. l0, 1925 v 2 Sheets-Sheet l March 4, 1930. P, J. slMMEN 1,749,234

AUTOMATIC TRAIN CONTROL Original Filed Feb. 10, 1925 2. Sheets-Sheet 2 Jes ,i Patented lVlar.` 4, `17,930 y i y l y v y retin or EDEN, NEW YORK f Aerei/ Infine VT11-Aria certamen e Application' lled.February` .16j-192.3, Serial No. 618,193. Renewed May 17, 192.8.

Y l This invention relatesto rail'vvaygsigna-lling track, perforating magnet 18 will operate;

' y1:15 rviews.andn Which+ f i systems, `especiallyto .sys-tenis inl which inv and when signal No. 6 is displayed along the f striirnenftalitiesoi'jthe control of a train are track, perforating magnet 19vvill operate.

positionedboth along the trackway and on I iig.k l shows a. track consisting of rails 5 .the train, and more particularly to systems l and 2. Rail ly is electrically continuous and 55 in which :theinstrumentalities arecontrolled raill2 is divided into sections by means of `both manually and by the presence or absence insulatingjoints 3 thus dividing the track oi'avr train upon the trackway. f f kinto block sections. Near one end of each @In describing the invention in detail referblock isr a track battery l and near the other 19 ence is had to the ,accompanying drawings end of the block is a track relay 5, c'onsti'tut- 60 Whereinl. have illustrated :a preferred phy-i ing Withtheir connections to the rails, a track f Smal gmbodimentefmy invention and Wheref circuit Well vvknown in the art, Each track in like characters of'reference ydSgll-,tc Golflelay controls an armature 6, which when the responding v parts `throughout the vseveral ytrack relay is energized, closes three front Y l y l if contacts7, 8 and 9, and when the track relay 55 Figure l isaydagmmmafg representation t deenergized, the armature ldrops and opens ofthe apparatus andclircuits adis'patchers these front contacts, Front contact 7 is conloffice and 'along a track; Fig. 2, illust-rates nectedby wire 22 to impedance coil and the appa-'ratusand Vcircuits'von a locomotive lthence by Wire k2li to polarized; relay 10 and 29 oricar by, which, VVVWith certain cooperating thence by Wire .25 and Wire 26 to track rail 70 t K parts ofv Fig.' 1, the signalsare rep'eatedfon l, Front contact 8 is connected by Wire 27 theloconiotive or car.v y f f. v l to condenser v28 and thence by `Wire 29 to alterilIn Eig. l are ,shojjvny six signals for each,y Dating current relay l1 vand thence by wire bloclgdes'ignated as Nos.f12,"3,^4,5 &Hd 6.,. SO'yand 26 to track rail l. Front Contact 9 is yllhesje signals are erected along the trackway connected by Wire 3l to l,train control rails yat suitable locations-in theusual, manner S0 322111,61 33 the Operation Gf which will be as to vbe easily visible to an engineer on Aan described hereinafter.l From the hinged end approaching tra,in.-'-These six-,signals are con- 341 of. armature 6 of track relay 5, a. line Wire i rollegdg-hytlie scveralpositons of a polarized 35 connects to a terminal-36 yat the dispatchrelay 10, and an 'alternating ycurrent, relay 11. ers ofi-ice. From this terminal 36 extend three 80 en positioned ,the armatures of relays 12 me Current generator 4L bothfof Which'are along the' trackway suitdistinct branches,thesebeing parts of circuits ahlyhoused. t In the] dspatchers' office are which are-established by means of manually corresponding relays, ya Apolarized relayl2, operable switches 37an'd 38 thronghpositive andan alternating.y current relay 13,"The sevbattery 39', negative batteryvvll() and alternatand ki3, control siX. perforati'ng niagnets14e,V first circuit is as tollowszirom ter- 'i 15, 1.6, 17 18 and 19. V-'I"lv1eseperforating magininal 3,6, impedance coil 42 Wire 43,7polar- 5 nereratirg magneten@ Operated; perfcrat- 39V andv thence fromne atve pole of battery k'T15,'played,along the `track perorat-ing inagnetl ized relay 12, switch 37, spring contact 50,

`netsQare located adjacent to a record sheet ized relay 12, switch 37, spring Vterminal ,44,

' 20 in the dispatchesoiee, so thatwhen the `Wire,l5,bi 1s 46, to positivevpole of battery 90 ing'needles 21, Willinake 1a perforation on 39 through Wire'47, Wire e8 and Wire i9 to the record sheet;v ,When signal Noflris dis;` a connection with track rail l.

played along the track perforating magnet y',Ihe second circuit is as follows z-ffroni ter- 14; will operate; When signalNo. 2 is dismina-136,'impedance coil 4:2, Wire 43,*polar- Willoperate; Whensignal'No. 3 is displayed Wire 51, bus 52, ,to negative pole'of battery alongY the` tra-@1s prforatne magret 16 will 40 and thence by Wires 53., e8 and 49 to encon operate; Whensignal No. 'flis displayed along yneet-ion. with track rail l.k

l lthetrack, perforating magnet 17 will .oper-l Thethird ycircuit is as followsfffrom terate; whensigaalledsplayelelcrgthe minal, @finders-@F542 Wile, alternating. 00

' current relay 13, rnanually operable switch' `38,spring contact 56, Wire 57, bus 58, con# denser 205 to alternating current generator 41 and thence by wires 59 and 49 to a connection With track rail 1. Y

Impedance coils 42 are inserted to prevent the iiow of alternating current through the circuit in which they are inserted, .and condensers 54 and 205 to prevent the lowrof positively energized but alternatingv current direct current through the circuit, in which they are inserted.

By means of these three last ydescribed circuits, depending upon the positions of the inanually operable switches 37 and 38, six f different electrical conditions can be established in the relays 10 and 11 along the track and in the relays 12 and 13 in the dispatchers oiiice as follovvszv f First condition-When switch 37 is in contact With spring contact 44 and switch 38 is in contact with spring contact 56., polarized relays 10 and 12 are positively energized and,V alternatingcurrent relays 11and 13 are also energized.V Y p Second4 c0hditi01i.-l/Vlien switch 37 is in contact with spring contact and switch 38 is in Contact withspring contact56,polarized relays 10 and 12 are negatively energized and alternating current relays 11 and 13 are also energized.

'Third c0mZiti0fh.-'Wheny switch 37 is in contact with spring Contact 44 and switch 38 is open, polarized relays 10 and 12 are relays 11 and 13 are'deenergized.

Fourth c0ncZiti0rL.-l7lien switch 37 is in contact with spring contact 50 and ysivitcch"f38 is open, polarizedrelays 10 andf12 are'nega.

tively energized, lbutV alternating current relays 11 and 13 are Vdeenergized. Fifth condition-Then switch 37 is open and switch 38v rnakes contact with Contact spring 56,.the polarized relaysl() and 12 are deenergized,`but alternating current relays of track relay 5, front Contact 7 wirey 22,'Y impedancey coil 23, l wire 24, polarized relay j p 10, Wires 25 and'26 to track rail 1 and thence 11 and 13 are now energized. Y r

Sixth conditioh-Vhenswitches 37 and 38 are both open, allfour relays lOand 12 and 11 and13 are deenergized.

' yi will new describe the tia-emitters byk which the polarized relays `Vr1U and 412iv are either positively energized or'negatively energized With direct current and the circuit by which alternating current relays 1 1and 13V arev energized,the several combinations of which control signals'Nos.. 1, 23, 4gand 5 and the corresponding perforating magnets 14 15, `16, 17 and is. v f vPositive direct vcurrent circuit-Froinvpositive pole of battery 39 inthe dispatchesoff tice, bus 46', WireV 45,l contact spring 44, switchA 37, "polarized, relay 12, Y wire 43, impedance coilA 42, terminal 36, line Wire 35, armature through Wires 49, 48 and 47 to the negative p pole of battery 39.

Negative -ctirect current circuit-From negative side of battery 40 inthe dispatchers otlice, bus 52, ,Wire 51, contact spring 50,

switch 37, polarized relay 12, Wire 43, pedance coil 42, terminal 36, line wire 35,v

armature 6 of track relay 5, front contact 7,

Wire 22,i1npedance coil 23, wire 24, polarized e relay 10, Wires 25 and 26 totrack rail 1 and Y thence by 'wires 49, 48 and 53 to the positive side of battery 40, thisl circuit being traced against the How of current.

Alternating current circuit-.Alternating current generator 41 inthe dispatchers oiiice, c0n`denser205, bus 58, wire 57, contact spring 56, switch 38,'alternating'current relay` 13,

wire condenser 54, terminal v36, line Wire 35, arniature 6 of track relay 5, front contact 8, Wire 27, condenser 28, Wire 29, alternating current relay 11, wires 30 and 26to track rail 1y andthence by wires 49 and 59 lioiv of alternating current through the circuit in which itisinserted, and condenser n Y 28 is inserted to perventlthe flow of 'direct to thealter-V Y' nating'current generator 41,.,` Y I1npedance'coil23is inserted to prevent'the currentfthrough-the circuit in Which itis in? i serted.

Il will now describe the'operationof signals Nos. 11, 2,3,"4, 5' and 6, 'depending upon the several electrical conditions'ofpolarized relay 10 land alternating .current relay 11.

W hen polarized relay 10is energized withv positive direct 'currenty and' alternating currenty rclayrll 'isenergized with lalternating i,

, current,neutral larmatures 60 and`61 of re'rv layV 10 make contact withfront contacts 62 and i'fa'nd PolalZGd armatures 6'4and 65 if; Y

y .e 66 of relay `11 ,Inake contact' with front con are in the right hand Yposition Vand armatures tact 67. ThisA positionv of the several arniatures establishes a circuit through signal No. 1 as follows z-iroin battery 68, wire 69, arrnature 66, front contact 67, wire 7 0', armature negative direct current 'alternating current relay' v11 v1s energized with alternating cnrrengneutral arniatures'GO and61 or" re-. lay' 10 make contact with frontcontacts 62 and '63,"but polarized "armatures 64and 65 f are nofwinithe letthand,positionV and arinaturef66 of relay 11, niakes contact with front contact 67. armatures establishes"a circuit through sig! nal N as follows z-roinbatt'ery 68, wire 69, armature 66, front contact 67, wire 7 0 agr-wn 1nature'60,`front Contact 62, wire 71, :po-lari ized armature -64,contact'74, signal No." 2,"a'nd lWire 73v tothe othery side of battery 68.V

. l/Vheny polarized relay `l() is energizedwith pcsitlveffdlrect current, and alternatingy curi This Vposition the several y y l A 'i u Willthushe'seenthat the dispatcher may rent krelayL 11`is deenergized, neutral arma# @tures 60 'and 61 of relay 10 make contact with front ycontacts 62 and 63 and polarized armatures 64-and are -in the right handpcsition, Armature 66 of'relay 11 makes contact with back. Contact 75. This positionv of the several yarmatures.establishes a. circuit through sig- 1 nalfNo. 3 as follows from battery 68, Wire 69,'Y armature 66, backV Contact T5, Wire 76, 'armature 61,front Contact 63, Wire77, armav ture 65, Contact 78, signalfNo. 3, Wire 73 to other side ofibattery 68.

When-'polarized relay 101s energized with negativas vdirect current, and alternating cur-y rent relayll 1s dre-energized, neutral armatures' 60 and 61 of relayfl-O make contact with y front contacts 62 and 63 and polarized armatures 64and'65 are inthe left hand position.

Armature.66,-of relay'll makes contact with back contact 75. Thisposition of the' several armatures establishes a circuit through sigvnal No. 4 as folloWsz-from battery 68, Wire 69, armature 66,back1'contact 75, Wire v76,

are'

'ai c s When polarized relay 10 is deenergizedand 'armature61, frontcontact 63, Wire 77, polar ize nel 3 to the other` side of vbattery 63.

'Y alternatingcnrrent relay 11is energizedwith y v alternating current, neutralarmatures '60 and c 61* of relayl() make Contact Withfbackconytacts 8() ando81.y Armature A66'of relay y11 inal'rescontact With'front contact 67 f'llhis position' of thes'everal armatures establishes `rcuitthrough signal No. 5 as follows?- irinbatteryf, Wirey69', armature 66front vcontact 6?'tv`i're970, armature v69, back contact other'sideof battery 68.v

A80,1Wire,82,1signal No'. 5' and yWire'73 tothe *vl/Villen* polarized relayjlOis deenergized and ialternating current relay V11 isyalso de'energize'dneutral'armatures 60 and61 ofy relay 10 i lnafke-contactv'with `loack contacts 80 and 81. Armature 66 ofrelay 11 makes contact with back contact".75.` l Yeral *armatures f establishes a circuit through4 Thisv position ,ofA the s'ev signal No.f 6 as follows :effroin batteryl 68j, 'Wire 69, arn'iature 66, back Contact '7 5, ivire'76,

, armature .61,"backf cont-act 81', Wire 83,; signal No. '6 an'dwireu tothe other side vof battery display any one kofthesix signals'bythe sevf eral ,positions of thek `manually operable switches 37 and 38, but in additionto this man-y ual control by the dispatcher, automatic control of these signals is also provided'fo-r by va traclrcircuitin the following manner As long asther'e is no train in the block ahead,

track relay 5 is energized, and armature 6 of `track relay 5' closes v,f rontco-ntacts 7, 8 and 9,y

thusffpermitting flow of current from the dispatch'ers ofiice, Whenhoyvever atrain is in the block ahead, as shown in hatched lines,`the

v fromtrack battery 4 s Snort eircaited .throughthe'Wheels 'and'kazgles of the ,train armature 65, contact 7 9, signal No. 4, Vand 'hinged at 90.

Aother siderof battery 95.

when there is a train in the block ahead, ir-

respective'of Whether switches 37 and 38 in the dispatchers office are positioned tosend electrical energy to relays and 1l.

4rDevices Nos, 1, 2, 3, 4,5 and 6 are vmerely schematicr and may be signal lamps which are lighted when their respective circuits are closed, or they may be translating devices such as relays by which circuits are controlled to operate semaphore signals, or any other electrical device, in a manner Well known to those skilled in the art.

.Y l Will now describe the recording apparatus vr1n the dispatcherls oliice. A record sheet 20 is suitably mounted and driven by a roller 84,

`which in'turn is driven by a shaft 85. Shaft 85 receives motion through ratchet wheel 86. A pawl 8T is pivotally connected to armature 88 "of electromaget 89. Armature 88 ,1s When electro-magnet 89 is periodically energized, motion is given to the ratchet Wheel through pawl 87. A spring 91 normally pulls armature 88 and pawl 87 to the right, when electro-magnet 89 is noty energized` Electro-magnet 89 is connected by Wire 93 to a makeandbreak device 92, Which malr'e-and-break device is periodically operatedloy clock work 94, this may Well be of the form'shown'in my prior patent No. 1,203,146 granted Oct. 21, 1916. When the make-andbreak device is closed, the electro-magnet 89 is energized through the following circuit hattery95, wire 96, magnet 89, Wire 93, makcand-break device 92, wires 97 and 98, to the The make-andhre'ak device 92 is operated, say every 5 seconds, by the clock work so as to give a slow and -uniform movement to the krecord sheet 20,

'through ratchet wheel 86 and pawl 87.

rlhe record sheet is tranversely divided Yintosectiopns as 99, 109 and 101, each section representing a blocky along the track. Longitudinally the record sheet is divided into tune lines such as 1 a. in., each one of the hnes rep-l `1esenting a one minute interval. Since thc make-and-break device 92 is operated continuously,it will be seen that longitudinally the record sheet assumes aconstantl chane- 2') ing position, during the 24 hours of the day. VAdjacent to record sheet 2O are located perforating magnets 14, 15, 16, 1T, 18 and 19, foreach vspace representing a block upon the record sheet." Pivotally.attached to the arma tures of these p'erforating magnets are perforatn'ig needles 21 so positioned ad3aeent to other side of battery 95.

the recordesheet thatwhen a perforating magnet 'is energized, a perforation is made upon the record sheet. There are six such .periorating magnets for each block, so positioned e current, neutral armatures V102 and ,103 of polarized relay 12 makel contact With frontcontacts 104 and 105 and polarized armatures 106 and 107 are in the right vhand -position and armature 108 of relay 13 makes Contact i with front contact 109. This position of the several armatures establishes a circuit through perforating magnet 14 as follows frombattery 95, Wire 98, Wire 110, armature 108, front contact 109, Wire 111, armature 102, front Contact 104, Wire 112, polarized arina ture 106, Contact 113, Wire 114, perforating magnet 14, Wire 115, bus 116, wire 117, to the other side of battery 95.

vVhen polarized relay 12 is energized `with .2; Vnegative direct current and alternating lcurrent relay 13 is energized With alternating current, neutral armatures 102 and 103 of relay 12 make contact With front contacts 104 and 105 and polarized armatures 106 and 1,07 of relay 12 are new in the left handposition. Armature; 108 of vrelay 13 makes con-Uy ta ct- With front-contact 109. This position of the several armatures establishes va circuit through perforating magnet 15 as follows from battery 95, Wires 98 and 110, armature 108, front Contact 109, Wire 111, armature 102, front contact 104, Wire 112, polarized arinature 106, contact 118, Wire 119, perforating magnet 15, Wire 115, bus 116, Wire 117, to

Then polarized relay 12is energized with Y positive direct current and alternating currentrelay 13 is deenergized, neutral armatures 102 and 103 of relay 12 make contact 1i; with front contacts 104, 105 and polarized armatures 106 and 107 are in the right hand position. vArmature 108 of relay-13 makes Contact with back contact 120. This position of the several armatures establishes a circuit through perforating magnet 16 as follows from batterry 95, Wire 98, Wire 110, armature y 108, back contact 120,'Wire 121, armature103,

i front contact 105, Wire122,l polarized armature 107, contact 123, Wires 124 and 125,7bus 116, Wire 117,v to the other side of battery 95. When polarized relay 12is energized with `'negative direct currentand alternating current relay 13 is de-energized,'neutral armatures 102 and 103 of relay 12 make contact .withA frontcontacts 104-and'105 and polarized larmatures-'106 and 107 are in the'left hand position. Armature 108 of relay 1311 Vmakes contact With back contact 120. This position of the several armatures establishes' 'a circuit through perforating vmagnet 17 as follows 2--battery 95, Wires 98 and 110, armaf ture 108,1back contact 120, vvire 121,v armature 103, Yfront contact 105, Wire Y122, karmature "107, Contact 126, Wire 127, perforating magnet side of battery-95. y Y

When polarized relay 12 is deenergized and alternating current relay 13 is energized With alternating current, neutral armatures 102 and 103 of relay 12 make contact with 17, 'Wire 125. bus'116, Wire 117, tothe other back contacts 128 and 129 and armature 108 `Y of relay 13 makes contactl With front contact 109. This positionof the several armaturesv Y establishes a circuit through e perforating magnet 18 as follows z-from battery 95, Wire 98, Wire 110, armature 108, front contact 109, Wire 111, armature 102, back contact 128, Wire'130, perforating magnet 18, Wire 131, bus 116, Wire'117 ,K' to the `other side of battery 95. Y

. Y feoV When polarized relay'Y 12 isdeene'rgizedf andl alternating lcurrent relayv 13 is alsoV de;y ene rgize'd,`neutral armatures'102l and'103yof relay 121 make-contact Witlrback contactS 95 y i i 128 and 129 and armature 108 ofrelay 13 makes contact With back contact 120. This position of the several armatures establishes a circuit through perforating magnet 19 fas followszfrom battery-95, Vyvires 98-`and 110, armature-108, back contact120,; Wire V121,

the other side of battery 95.

It'will be noted that the. circuitithroughj perforating magnet `19 isftakenthrougha circuit breaking device` 135, so that this lcir-A cuit isperiodically made and -broken.e This circuit breaking device operates asfollows Metallic .contact plate 13,5, is attached to armature 88 and Vinsulated therefrom'. Everyk time the-magnet 89 is energized, which is heretofore stated is say every -seconds, the

contact through Wires 134 and136 is closed through the metallic plate 135. When magnet 89 is deenergizecl armature 88 is pulled to the right by spring 91`and thecircuit beV` tween Wires 134 and 136 is broken. By reason fof this periodic breaking of the circuit through perforating inagnet'19, a continuous perforation is made on the record'sheet as vlong as relays 12 and 13reinain deenergized;

This of course occurs everytime a trainenters a block Whenv armature 6 of track relay Y i y 5 drops, thus breaking front contacts 7, 8 and 9V under Which conditions,.the'main circuits from the dispatchersotlice are broken. It Will l,thus be seen that when atrain entersa kblock,perforating,magnet 19 commences to Y perforate, thus recording-the exact time When 10o 'y i; armature 103, Y back corntact'v,129,'livirev V13,2, i Vperforatingmagnet 19,V Wire 133, bus 13.4, metallic contact 135, Wires v13G/rand 117k to the, train enters theblock and'this perforat- .ing magnet continues to ptertorateuntil the is made onthe record sheet,V o ingv magnets arepreferably so constructed 'train haszlett. the block, thus recording the length of; [time it remaine'din the block. v

f The circuit through perforating magnet; 19-isthe only one taken through the circuit f breaker 135 and thereiorethis magnet is the e 'only onevthat makes a ycontinuous record.`

Th@ circuits through perforating" magnets 1d 14,/15, 16, 17 and'18 are y'not taken through this circuitbreaker and therefore' when the circuitis closed through these severeal perforating magnets, only a single perforation The perforatthat When the Vmagnet is energized, the pertorating needle is driven through the record sheet` by` momentum but the` perforating needle Will immediately Withdraw from the record sheet evenif the armature of the. perforating magnet is not released immediately. A yperforating magnet of this charactei'vfis shown in j myprior Patent, No.1,138,804 .granted tonie, May' the 11th, -1915. It is noticeofvthe engineer, or the effects soC ob-` vta-inedon the locomotive may alsobe used tor l thepurposes ofgautomatic train control or obyious that any one of the perfoiating magnets can be so arranged that a continuous record` can be made by it as long as thecircuit throughy it is closed vby connectingthe same tobus L134, yinstead of" bus 116. By such a connection, the circuit 'throughthepertorat- ,ing magnet is periodically broken at .circuity breaker 13:5;-

I Under certain conditions t yiti-may be desi-rableto duplicate the six signals or` instrumentalitiesalong'the track on the` locomotive soyasrto forcibly bringy these to the speedcontrol. Thejmeans: :tor duplicating thesinals' onQtherlocomotive or carwill now be described.

Fig. ,1 train'ycontrol rails'32and are locatedadjacenttov the track, train lcontrol rail 32 beinga home train control rail, posi;`

tionednear the beginning of the new block,

'and' train controll rail'y 33 beingthe distanttrain control rail, positioned approximately d braking' distance from the beginning of the block;v g Ashereinbefore .described these train contro-l rails, When? track vrelay 5 is en,-

` erg-ized, are electrically connectedto the dispatches office-through line wire 35, armature l. Bor:

650i track relay 5.-,-vfro'ntrcontact`9.and Wirey fyaldthereforef the ,trainjcontrol rails can be,electricallyI Conditioned tothe six Vcondifl tionshereinbefore described.4 It We now in- I sert fafcabcircuit; Whichis located on the locomotive rbetween train control rails 32 ork 33 and track rail 1 andplace on the'locomotive,

",aI polarizedlrelfly Similar to relay., 10 and an alteiin'ating vcurrentrelaysimilar to relay 11, the sin` signalindi-cat-ions may. beiduplicated fron'fthelocomotive;

"I,The,apparatusand circuits necessary `to duplicate 'the' six signals on the 4locnnotiye are shown in Fig. 2, andr arek similar to the apparatus andcircuits shown in myprior Patent No. 1,399,027 granted to me, Decem-` ber the 6th', 1921. i

InFig. 2 the six instrumentalities correspendi-ng to the six electrical conditions of the train control rails are designated as signals A, B, C, D,1Fi, F.- While these instru.- mentalities in Fig. 2 are shown as lamps they may equally as Well represent an electromagnetic device to Which motion is given depending upon' Whether the circuit. is enc'igizedor dee'nergized and such electromagnetic devices may be used for other purposes or in addition tothe display of signals to the engineer such as the proper control of speed vcontrol devices or electro-pneumatic air valves or both.

- In Fig. 2 is shown an electrical contact shoe 137 so positioned onthe locomotive' as to make contact with train control rail 32. The

contact shoe is 'hinged at 138. Train controlv n rails 32 and 33 are inclined at the ends so as to form a ramp in the usualmanner, such as is shown in my prior Patent No.` 1,140,623

granted May 25,1915, and When the contact shoe slides along this ramp, the'shoe is tilted,-

so as tofbreak kcontacts 139, 140, and 141. This 'tilting' motion of the shoe compresses a spring, 142. y Vhen the contact shoe leaves f the other endof train control' rail, spring 142 torcesL the contact shoe to the normal position, againclosing contacts 139, 140 and 141.'v ,A metallicplate 143y fixed to coi'itac't shoe 137 but insulated therefrom is sofposi# tioned as to make contact With'contacts 140 and 141. A

-The locomotive also carries alternatingcurrent relay 144 with its companion direct current Winding 145, a. polarized relay 146i,

a battery 147, and another battery y148. Alternating current relay 144 and' its conipanion vdirect current coil 145 control the position oi' armatures 149 rand 150. -Folarized relay 146 y controls the position of neutral armatures'll, 152', and l153 and also polarized armatures 154, 155, 156 and 157.- Pola- r-y izedarmatures 156 and 157 are pole changing members of a switch for. the `purposev oi changing the polarityot the iiow of current rom'vbattery 147. serted tolprev-ent the low'of alternating cui"- rent inthe circuit, in which it isfinserted, and condenser ,159 is inserted to preventgthe ]mpedance coil 158 is in'-l lili) i cuitis completed through the dispatchers of@ lice as hereinbefore described.

The circuit for the alternating current'energy from the dispatchers otiice between train control rails 32 or 33 and track rail 1 heretofore V-mentioned is as followsz-from train control rail 32, contactshoe l137,wi res 160 and if 169, condenser 159, alternating .current re-' lay 144, wiresf170, 164, 165 and 166, aXle 167, wheel168, to track rail 1 and thence the circuit is completedv 'through the dispatchers office as heretofore described. c Armature 149 Vof relay 144 controls a stick circuit through coil 145, which lwill be described later andarmature 151, of relay 146 controls a similar stick circuit for relay 146, which will also'be described later. Y

It will thus be seen that when contact shoe 137 on the locomotive is in contact withfa train control rail 32 or 33, polarized relay'1`46 and alternating current relay 144 are under" A, B, C, D, E and F, when contact shoe 13.7k

is in contact with a train control rail.y

4First t-When polarized relay 146 is' energizedwith positive direct current and alter-y nating current relay 144 isfenergized with aly ternating current, neutral 'armatures 151, 152

and 153 of relay 146 make contact with front contacts 171,172 and 17 3 and polarized'arm'a'- tures154, 155, 156 and 157 of relay 146 are in the right hand position, thus making contact-,with their respective contacts 174, 175, 17 6 and 17 7.' Ar-matures 149 and 150 of relay 144 make contact with front contacts 178 :and

179. This'position ot theseveral armatures establishes a circuit through signal A as follows :lf-from one side of battery4 147, wires 180 'and 181, contact 176, polarized armature 156, Wire 182, armature 1510, front contact 179, wire 183, armature 152, front contact-'17 2, wire 184, polarized armature 154, contact 174, signal A, wires1185, 165 and 186, polarized armature 157, Vcontact 177, wire 18,7, to the "otherfside of battery 147'. f i i As4 the contactishoe 137 leaves the other end ot the train control rail, the position of the armatures of relays 146 and 144 are maintained in the same position after the electro, mot-ive forces .rom'afthe dispatchers oiiicecease to iniiuencefthem through the following twostick circuits :-,AsV contact lshoe 137 leaves the train controlrail, spring" 142, closes contacty 139, 140 and 141 and a stick circuitis established through coil of :relay 144 as kfollows :f-.rom battery 148, wire 188,'coi1145',

wire 189, contact 141, metallic plate 143c0I`1--v tact 140wire 190,' front contact 178, armature 149, Wire 191, toY other side of battery 148. Vf

The Second .Sack Circuit is @Stabil-Shed Y through relay 146 as follows A:mirom battery 147, wires`180 and 181', contact 17 6, polarized armature 156, wire'192, armature 151, front contact'171, wire 193, contact 139, contact! shoe 137, Wires and Y161,'impe'dancecoil l Y,

158, wire 162, polarized relay 146, wires 163, 164 and 186, polarized armature 1 57,contactv 177 wire 187 to the other side ofbattery147.` Second z-.VVhen polarized relay 146 is energized with negative direct current and alternating current relay 144 lis energized with alternatingV current, neutralarmatures 151, Y

152' and 153 of relay 146 make contact with front contacts 171, 172 and 17 3 but polarized armatures 154,155, 156 and 157 of relay 146 are now in the left hand position thus making contact with their respective contacts 194, 195, 196 and197. Arm'atures 149 and150 of relay` 144 make contact with front contacts'17 8 and 179. This'position of the several armaturesv establishes a circuit through signalB as followsz--from'one side of battery 147, vwire 187, contact 196, polarizedarmature 156,'Wire 182, armature A150,v frontv contact 179, wire j 183, armature 152, front contact 172, Wire 184, armature 154, contact 194,'signal B, w1res-185, and 186armature`157, contact 197, wire 180, to the other sideA of battery 147 Ythe cir! cuit being traced against the flow of current.v A s the'co'ntact shoe 137 leaves theother end of the train control rail,A the position ofthe armatures of relays`146 and 144 aremaintained inthe samepositions through the two" lay 144 beingthe same'as -hereinbefore de scribedandthe stick circuit through 146 being as follows z-battery 147, wire 180, con` tact 197, armaturey 157, wire y186, wire 164, wire 163, polarizedrelay146, wire 162, im-

pedancecoil 158, wiresx161and 160, contactv 11o 171, armature 151, wire 192, armature 156,

shoe 137,contact 139, wire 193, front contact contact V196 andrwire of battery 147. i Y vl 'lhird'z-VVheriY polarized relay 1 46 is'cnV ergized with positive direct current and alternating current relay 214:4L is deenerg'iz'ed neutral armatures 151,152 and 153, voi' relay 187, to the` other side 146 make contact withfront contacts 171, 172 l l l and 173 and polarizedarmatures 154, 155,"`

' 156 and 157 of relay 146 are inthe right hand., position thusv making Contact with their restick rcircuits, v The stick circuit `through ref spective contacts 2 174, 175, 176 and'i 177.'V l

Armatures 149 and 150 of relay 144Vhave now dropped away from their i'rontcon'tacts*andV Y 1 l l,

125 rThis position `of thefseveral armature 150 now makesicontact with back contactv 198.y

armatures establishes a circuit throughV signalV C asl follows 2--irom` battery 147 wiresr180f and, 181, contact176,armature 156, wire '182, f

armature 150,:-back-contacti198, wire 199,

i armature 153., front. contact,173,"vvire 200,V arinature155, Contact 175, signal G, wiresilS,

ifaeassa 1:65yand`l 1186, arm-ature157, contact y177, and

' Wire,187tothc other side. of battery 147.

' -coil{145, While contacts140and141 are noxv closed', 'isnQm-openat front contact 178.-Y The',l stickcircuit of-relay 146 however; is still op-f l p Asthecontact shoe137'leavestheother endv VAfolli the` train control rail, armaturesy 149 and 15dgot relay 144 remain. inV they deenergized,`

position, since; the stick circuit controlling feratye as hertoitore described andthe position v.of-the armatures of this relay remain the same.

Fourthkz-fllllhen polarizedrelay 146 is energized; Withnegative direct current and altei-hating` current relay 144 isl deenergized y' neutral?armatures15'1, 152, and1i53 ot relay 146makex. contact with.' front. contacts 17:1, y.172` and; 173; but polarized armature1j54, 155,

15,6; and f L57`v of rel-ay f 146;; are noW in the left] hand posi-tionthusmakingcontactwvth their.

respective contactsl.194,195,' 196V and 197.

i Armatures149 and 1500i relay 144 have now i tures establishes a circuit through signal Dy Y as, tollovvsgzjfefrom .battery 147, Wire 1,187, conl ispo dropped awayitrom their front contacts and armature 1504noxvy makes contact with back e Contact 198:,- thistposition ofthe severall arma? tact-19.6 armature 156', Wire 182, armature 150,', back contact 198,: Wirec199, armaturel,

. vfront,k Contact 173, Wire200, `armature155, Y .y contact.1195, signalI lDvviresj1'85,` 165 and 186,

armature4 15:7, contact 197', Wire..180.,: to the ,other side offbzattery 147, circuitb'eingutraced againsttthe flow of current.

As theficontact shoe.137 leaves. the other end 'Y vof@ti-aincontrol rail', the stick circuit through relay t 144`rem ai ns inoperative' as hereinbefore,y

N vergized' ralternating current relay l144 is I energized;v with ,alternating current,` neutral! f1 armatures 151, 152 and y15,3, drop away and.

'armatures 152.andf153 make contact with the l backffcontacts 201 and 202; Arinatures 149- -and150iot relay 144y make contactavith front contacts 178andi179.: This position of they.

several armatures, establishes a circuit through sign'al'lE; asy follows :v-from. battery 1473 Wires 180 andl 1181, Contacty 1765;. armature 156", Wire y182,1' armature 150',vv front contact` 179,1 Wire: 188,-.armature 152, back contact-` 201', vv-irev 203, signal E,\1Wir`es 185, 165' and 186, polarized armaturek 1,57, contactr177,l and,

y Wire-18731tofthe otherside of battery 147. e

`As the .contact shoe 137f'leavesthe other end" ofthetraincontrol, rail,`v` the stickf circuit rthrong/,rh relayg1'44" is operative since the r'ontfA Contact178-iis`now-l closed but'the stick circuit,throughrelay146:'is rinoperative since WillenA th1s--cond1t1ony exists vno' electrical i the vkfrontContact171nis now open.

- SiXthy-When polarized relayf146zand al-v reached.

ternating current, relay 144 are both deenergized, neutral armatunes 151, 152 and 153i of relay 146 drop away and armatures 152 andI liimake contact kwith back contacts 201 and 202, armatures 149r and 150 of relay7 144also drop awayandl armature 15,0 makes: contact with. back contact 119,8. This position ot Athe several armatures establishes a circuit through'signal" as follovvsz-from battery 147 Wires 180 and 181, contact 176ar1nature 156, W;ire 182,'armature 150, back contactv198, Wire- 199, armaturezl, .back contact. 202., wire 2.041signal F, Wires 185, 165 and 186, armature 157 contact: 177Wire 187, to the other side of battery 147'. Itis to be observedthat the polarizedarmatures 154, 155, 156 and157 rennainfin their position upon a; deenergi'zaf tion of 146, so that a ycircuit can always bey made through them. Of course applicant doesy not intendto exclude any other type-ot relay which may be applicable for vthis situationas1thewell known polarized rotary ref lay is notto be excluded, as this relay may be used to close a circuit When deenergized or Whennegatively or positively energized.`

As the contact shoe-137 leaves. the other end ofy traincontrollrail, both stick circuits are new inoperative sincetrontr contacts 178 and 171are now open and therefore the exist-.-

ingposition of the several armatures is continueduntil'an energized train control rail is.

It must be understood thatzeach time contact shoe. 13.7 slides on to a train control rail,

both stick circuits,one through relay 144..

and the other one, through rela-yr 146,. are openedy at contacts, 139., 140 andv 141 and therefore bothrelays-146i andv 144 would bel gli) 4comeldeenergized, resulting in the display of signal F, unlessenergfy:y of some.y character furnished from the, dispatchers office, while f f contact shoe 137 is in contactwvitlra train ,control` rail.

f It will thusbe seen `,that under anyotl the six electrical conditionsv of the traiacontrol rails, one'. oaf-the six signals ontheI locomotivey is established, Whenv alocomotive passesa train control` rail and the particular signal established at `the train controlvrail is continued on thev locomotive until'fthefnext train' control rail is encountered. f y

vWhile the. dispatcher is thus ahleeby placling-.switches 37 and'38 in they several posie tions' described, to display six different f signalsfon the locomotive, any one ot these. signals is annulled and made inactive except' signalfF', if there isatrain in the block'ah'ead,

torthe reasong that fthe circuit establishing different electrical conditions in train conf trol* rails passes through armature oli .track relay"5, and when there is a train in' the block ahea'dpthe circuit romftlieV dispatchersiottice is broken-,at front contact 9 ot armature6.

energycanireach; train controlrai-ls 82 or 33,"

therefore invariably signal F will Vbefdis-Y played on' the locomotive,irrespective of whether'- switches 37 and 38 in the dispatchers oliice arev positioned to chargethe trainconcating to the engineer to stop at the nextV siding or remain on the main track or tostop at Ythe neXt siding and pullv into the siding or to stop at the next station and report to the dispatcher.V Or any of the six signals may be used for any purpose designated l by the executive oiiicers of the railway. y

Although I have particularly described and illustrated one preferred physical embodiment of my invention and explained the principle and construction thereof, nevertheless I-desire to have it understood that the form selected is merely illustrative, but does not exhaust the possible physical embodt ment of means yunderlying my invention.`

What I claim as new and desire to secure by Letters Patent of the United States is: l.In a railwaytrain control system, in combination: 1 a trackway; meansdividing the trackway into electrically isolated sections; a vehicle movable upon the trackway; train control instrumentalitiespositioned adjacent each `of the sections; train control insfrumentalities positioned uponthe vehicle; a central station; means manually controlled positioned at the central station wherebythe train control instrumentalities adjacent each section are conditioned to one record, thereof made at theicentral stat cooperation between said means. j Y y Y 3. In a railway train control system, inl combination; a trackway;fmeans dividing'- of six different conditions, and the train control instrumentalities upon the vehicle are correspondingly conditioned by cooperation with said firsttrain control instruinentalities,

' including means for recording at the central station the particular condition eected, '-7

2.y In a railway train A,control system, ing, n l

for six different Condit-ions, means `for auto; vmati'cally 'producing one' of saidjconditions.`

combination: a trackway; a vehicle movable Vupon the trackway; means dividing the trackway into electrically isolated sections; a centralstation; means located at the* cen* tral station and meansV located ,along the trackway and means located ongthe'vehicle whereby manual operation tov any one of six different signal conditions may be established along the trackvvay` andfon the vehicle, and

thetrackway into a pluralityof isolated track vtive ofthe operation of station of the circuit sections; arainp associated with each track .circuit section; Vmeans for causing the ramp v,to have six electrical conditions; l a vehicle having means for selectively"receiv-V ing thereon an'k indication'of any one of the' six electrical conditionsfof the ramp and means co-operative with the ramp for transl mitting said conditions; and means .position-ed at a central station for recording the electrical condition influencing the vehicle. v

4. In aA railway train control system, in combination; a trackway; means dividing the trackway into la plurality-.of lisolated track circuit sections; a vehicle movable on the trackway; train control instrumentalities positioned adjacent eachAV section; trainconf trol instrumentalities positioned' upon the vvehicle; a centralstation; and means manually;v controlled positioned at the central station whereby the train control instruinentalities Y adjacent each section are conditioned toon'e of six different conditionsandthe train conv trol instrumentalities upon. the vehicleare correspondinglyr conditioned .by cooperationf Y therewith.

5.a1In arailway trainvcontrol system,`in combination aV trackway; means dividing the trackway into electricallyv isolated sections; train control instrumentalitiesr posi- Y tionedY adjacent each of thesaidsections; al central station; meansy manually 'controlled positioned at the central 'station whereby the train controlinstrumentalities adj acentk each section are conditioned to one of siX dif ferent conditions; and means controlled by the presence of a train in arpreceding section for automatically establishing a particular condition of the train control instrumentalitiesat the entrancetoisuch sectionirrespec' said manually con trolled means.` j Y 1 j 6; Ina railway train cont-rol ksystem Vin combination; a trackway; means dividing` Y,

the trackwa-y into a plurality of isolated track sections; a vehicle movable upon the Vtrackway; train control yinstrumentalities positioned adjacent to each of the said se-c-` tions; a centralstation means 'manually controlled positioned atl the central ystation fr' A whereby the. train control iiis'trumentalities adjacent each sectionV are conditioned toone whena vehicle is in a precedingse'ction and' lished.A Y A 7.' In a railway. signaland dispatching system; a trac'kway divided into blocks ;.more

thanY three different si Unals for directing 4the ist i movement ofra trainapproaching each block in a single'direction'; and two meansforrthe j control of the signals,-rone means 'being track circuit and the Yother.beinglocate'd ata central point. c 5

Jai

12.1Iii; airailway signal` and dispatching ol'lice'l for conditioning said circuit l in more j Y s thanthree differenty ,waysppne way.: foreachsignalffrom-k said sources of current; track `of 8;. arailway signal anddfispatchingsys'- -tem;:a train vmore-than@three signals for 'governingthe inovementof a train in a single dvi-.A lrection;ltwo' ineans forthecontrol of thesi i ,nals, one kbeing automatic,the `other-"manna andfavcentraloce containing instrumentalities forf actuating the manual control means. .-9. In .la .railway-signaland dispatching sys- `ties for/governingthemovement of atrain containing` instrumentalities for actuating the. manualcontrol means. f'

eratedf. l l y j lill. .In L a f railway signal andv dispatching oi'icey for.' conditioning'-saidg ficircuit" in more signal zfrom-'saidzsources rvofJv current, and track circuit'lmeans Lfor 'also conditioning said sigsystem; a-trackway. `divided into blocks, each ilu-block provided .witilia track circuit; a central coince sources. of electricicurrents of different@ kinds 'ati!thecentrahoiiice. more f than three `signals governing train movements'intoeach block-;f.la circuit 'between-said .central otlice currents to said signals;means"at the. central Vcircuitrmeans fory also iconditioning'isaid signalsf;';and means for indicating atv the central lofiicerthc location'ot atrain, saidineans beingl actuatedbfy saidy currents.

'13..;.In. at railway: signal and dispatching system; astrackway divided into blocks A; ai, 1t-rack`;circuit foreach block; more than three Y signals `for governing "trains: entering a block in a single direction, onek of saidsignals indicatingvproceed to atrain, another signal in'- eef,- displayingany onerof more than three sig-*`rr dicating` stop means at a central. otlice.` for nals'; Vandgtrack circuit means for preventing "651e, iny .im araiiway signal .and .g dispaciiingVK thejdisplay ot fa proceed signal.when.- a, .train is-in the block.k l

system; a trackwaydivided into blocks,each.` 1 block provided:y with ajtrack circuit; a centraloffice.; sources. of electric currents of different kind'saat; the f central office; o more than three signalsl governing .train movi-nneiits into each block; :al: circuit between said central ofiiceandfffsaidv signals Vorzconveying? said electric cuirents'to said signals means vat thez central i.

andi-saidsignals for conveying said electric,

system; 1av trackway divided into blocks; more .than Vthree Vsigiialsat thefentrance to a block three signals; and track circuit means to prevent the displayo any but the stop signaly r'by the central o'iicefmeans if th e block is occupied by atrain.v

15.In-a'railwayk signaland dispatchingy system ;'more than three different signals for directing the movement of trains; two means o ff `for the control 'of the signals, one means 10;. In yaL railway .signal and dispatching system;v a train La central cnice; more than v fthree-signalsfor governing-the movement of ka traininfasingle` direction; andtwo means; forithe control of thefsignals, one being automatica'nd the 'otherfazcircuit controllerl-locatedatthe Vcentral oliicej and manually .0p-

'indicating or recording the location of a train. f y f 16. In a railway signal and dispatching system; ya trackway divided into blocks, each block provided with a track circuit; rmore than--three signals governingtrain inovef gofl ments in vas'ingledirection into' each block; a, circuit-foreach signal; Ameans ata central oflice fforfcond'itioningl ea'ch signal circuit;

and means independent of said central otlice f means oralso conditioning said signal circuits.

17. InfV a railwayy train control system;` in combination; a trackway divided into blocks; more than three signals, each diilerentiated from' the other; located adjacent each block;

vehicle carried train control instrumentalities corresponding Vto said signals; control means adjacent eachblock to the electrical condition of' which saidl control instrumentalities are severally responsive; central station meansy for selectively operating a particular'signal and establishing an electrical' condition" ofL said control means correspond-- ing to` the signalselected; means controlled by said central/station meansr fory automatically indicating-.thesignal displayed'at the ventrancefot a block and other automatically vop ei'ati've indicating means for indicating the movement ora vehicle through said block. i

iosl

'18. Inafrailway train control system, in

combination a trackway'divided into blocks;

`more than three signalsfeach,differentiated from the othei;`located adjacent each block; ",vehiclecarried train control instrumentallities corresponding to said signals; control means adjacent each `block to the electrical condition of which said control instrumentalities are severally responsive; central station .means for selectively operating a particular signal and establishing an electricaly conditioii of said control means corresponding to theesignal selected; means controlledby said .central station means for automatically indicatiiig the signal-displayed 'at the entrance oflsuch block ;'and other automatically operative indicatingi'm'eans for vindicating the 'movement of avehicle'through said block. `19. In aV railway train control systeiiiain4 combination; a trackway dividedinto blocks; more than three signals, each differentiated from theother, located adjacent each block;

vehicle carried train Vcontrol instrumentaliyties corresponding to said signals; control means adjacent each block to the electrical condition of which said control instrumentallities are severally responsive; central station 'means for selectively operatingfa particular signal and establishing an electrical condition morefthan threesignals each differentiated,

from theother, located adjacent each block;

vehicle carried train control instrumentali- .v ties corresponding to said signals; ycontrol rails adjacent eacliblock to the electrical condition ot which said control instrumentalities are severally responsive; central station means for selectively operating a particular signal and establishing an electrical condition of said control rails corresponding to the signal selected; vmeans controlled by said 'central station means for. automatically givi ing a continuousrrecord .of the signal dis- Y. played at the entrance of such block; and

other automatically operative recording means for `recording themovement of a vehiclethrough said block.v i,

21. yIn a railway train control system; in

from the other, located adjacenteacli block; vehicle carried train control instrumentalities corresponding to said signals; control"-r means adjacentv each block vto the electrical ingto the signal selected.

22.`A In a railwaytrain control system, in

combination; a trackway divided into blocks;

moreithan three signals; each diierentiated from the other, located adiacenteach block;A vehicle carried train controlinstrumentalities:V

corresponding to said signals; control means adjacent each block to the electrical-condition V of which' said control vinstrumentalities are-y severally responsive; central station means for selectively operating a particular signal and establishingfan electrical condition ot said control means corresponding to the signal, selected; and' means controlled by :the

presence ay vehicle in va blockffor autocentral station `means may havebeen operated.

blocks; a trackk circuit for. each block; Amore than three fixed signals Yat theA entrance to keach -block-;Va cab 'sig'nal on f each train; az

niatically'selecting the Voperation of a par"V 'y ticular signalgatthe entrance to such .block 'regardlessrofl they selection ffor which said lo 23. In a railway signal and dispatching`r system; a train; a trackwaydividedinto circuit'controlledat a central oiiice yand con-g.l

trolling said signals;rand track circuit means for also controlling said Signals. Y Y

24. In f a railway signalandidispatching .v

system; a train; a` trackway divided into blocks; fa track circuitfor each block; more oi'iice and controlling said signals; track circuit means for; also controlling said signals;

blockzto block, said .means being/'conditioned selectively by saidycontrol circuit. Y

than threeiixed signals atthefentrance to i each block; more .than three cab signals'on'jV leach train; a circuit controlledV atga central i and means ata fcentraloiiicegfor indicating Y and recording the progressof the train froml 125.51n airailway signaland dispatchingl' system; a train; .a' trackway divided into blocks; atrack `circuitor each'block; more A than three cab signals on- ,each-ftrain; a cir-,1 cuit controlledat a centraloiilce and controlling saidsignals ;V and track circuitmeansftor also controlling said signals;y i f 26. Ineja Vrailway '.signalfand'` dispatching system; a train; .a trackway divided'intol,l

than three cab signals on each train; a. cir-f cuit controlled at a central oiiice and controlling said sigiials; track circuit means for also vtralzoiiice for indicatingthe progress ofthe combination; a trackway divided into blocks; .more than three' signals, eachdierentiatediiosig i train lfrom block to block; said" means beinggx' Conditioned**selectively by Said, kCOIVrol ciri cuit.

27.' Inf-a'railway"V controlV system. lin ,f if 11.0,: 5`

combination ;Y a -trackwayr divided into-blocks;

more than rthree signals; e'ach'diferentiated from the other, located adjacent each block;

lectivelyy conditioning the Vcircuit of a Yparticstation means including circuits lhaving a common wire; a track battery and track relay for each block; andan armature controlled by the track relay and operative to open, or

circuits'lffor said signals; a relay capable in* Y' accordance with its electrical condition, ofzseclose the circuits of saidcentralstation means 'i at a pointzinsaidv common wire.

V28. Inf-a' railway signalyand dispatching i system; 'a' trackway divided into blocks; aiL

track circuit foreach block; more thanthree fixed signals at the entrance tov each block a l :tory givingy threeidiiferentindicationsto a: I train proceeding inra given direction; acircuit controlled 'at .a central oiiice and controliso Y ling'said signals; andtrack circuit ymeans for also 'controlling said signals.

29,.' InrailWay signal .and dispatching system; a `trackvvay, divided into blocks; a track circuitffor each block; morethan three n fixed signals Yat the entrance to each vblock c for giving three dierent indications'to the train; a vcircuit controlled at ak central oce 2x1-11dk Controlling `said signals.;` track circuit means for alsocontrollmg saidy Signals; andV means at 'a'central office forA indicating the ymovernel'ltofv trains, said means yloeing conditioned selectively by said control circuit.

f 30. Ina railway signal and dispatchingy n system;4 atrackivay divided into blocks, each n block provided With atrack circuit; a central f I oce; currents of different kinds at the cen- 1 tral office; y'more thany three signals govern y Qingfsaid signals.

ing train inovernentsinto each block; an electhree diiferentl Ways,one"for each signal; and track circuit means lfor also condition- VPAULl J'QSIMMEN.

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