US1939722A - Remote control apparatus - Google Patents

Description

D80 1933- J. M. PELIKAN ET AL 1,939,722

REMOTE CONTROL APPARATUS Original Filed Sept. 30, 1929 SLOW PICK UP 6 SLOW PICK- UP ENTORSj JTM Fall/{an Cf). Brooks,

N III III Q-a-W Patented Dec. 19, 1933 UNITED STATES PATENT OFFICE Y 1,939,722 REMOTE CONTROL APPARATUS John M. Pelikan and Charles A. Brooks, Swissvale, Pa, assignors to The Union Switch & SignalCompany, Swissvale, Pa, a corporation of Pennsylvania Application September 30, 1929, Serial No. 396,124. Renewed July 28, 1932 22 Claims. (Cl. 2463) a pair of conductors from a distant point, and of .means for constantly controlling an indication means over the same pairof ccnductorsby the switch or the signal, respectively.

We will describe one form of apparatus em,-

bodying our invention, and will then point out.

the novel features thereof in claims.

The accompanying drawing is a diagrammatic view showing .one form of apparatus embodying our invention. 7

Referring to the drawing; the reference charactors I and 1 designate the track rails of a stretch Y of mainrailway track connected, by

means of a switch F, with a siding Z. ,.A track section'A B is insulated from adjoining portions .of stretch Y and siding Z by means of insulated joints 2. Section A-B is provided with a track circuit which includes a battery 3 connected. across the rails adjacent one end of the section,

' and a track relay G connected across the rails adjacent the opposite end of the section.

Signals designated by the reference characters S and S govern eastbound traffic moves, that is, moves toward the right, as shown in the drawing, over. switch F, and. signals S3 and S govern westbound moves over switch F. Signals S and S govern moves over switch Finits normal position, as shown, for directing traffic along stretch Y only. Signals S and S govern moves over switch F reversed to or from siding Z, respectively. As shown in the drawing, each of these signals is of the semaphore type.- Signals S S S and S operate contacts 54, 52,

, 40 49 and 48, respectively, each of which is closed when its signal displays a proceed indication only.

A polarized switch relay T is controlled over conductors 6 and 12 by a lever V Lever V has two positions, n to the left and r to the right, as

shown in the drawing; Lever V operates two contacts, 4 and 17, each of which is closed while lever V is in its n position only, and two contacts,

l8 and'2fl, each of which is closed when lever V 50 is in its 1' position only. Belay besides having ordinary neutral and polar contacts, is equipped with a pair of special contacts 10 and 21. These special contacts are so constructed and arranged that the finger of contact 21 is actuated by the ringer of contact 10 which is,

closes before contact 10 opens.

also

inturn, actuated byv the armature of relay T. When relay '1 becomes de-energized, contact 21 When relay T becomes energized, contact 10 must close to actuate contact 21, and hence contact 10 closes before contact 21 opens. Relay T becomes energized in the normal or thereverse direction according as lever V is moved to its n or its 1 position, respectively. 7

Switch F may be operated by any suitable means 5 such, for example, as an electric motor. Circuits for causing such a motor to operate switch F to its normal or its reverse position are controlled by contacts 29 and 29 respectively, of relay T. Such circuits are well known and are therefore omitted from the drawing. Switch F operates a contact member 30, which when switch F is in its normal position, connects with a terminal 30 and, when switch F is in its reverse position, connects with a terminal 30*. Switch F also operates. a contact member 31 which similarly connects with a terminal 31 when switch F is in its normal position, and connects with a terminal 31 when switch F is in its reverse position. A contact member 8, also operated by switch F, 30 connects with a terminal 8 when switch F is in its normal position only, and connects with a segment 8 at all times except while switch F is in its normal position. A fourth contact member 25, operated by switch F, connects with a terminal 25 35 when switch F is in itsreverse position only, and connects with a segment 25 at all times except when switch F is in its reverse position.

When the direction of energization of relay T is changed from normal to, reverse, front contacts 10, 27 and 28 of relay T open. Relay T then becomes energized in the reverse direction by a pick-up circuit which. is completed through its special contact 21. Polar contact 9 of relay T then opensand contact 9 closes, completing a local stick circuit for relay T through contact 2525 of switch F. When switch F responds to the reverse energization of relay T, the local stick circuit just mentioned. is broken at-contact 25- 25 of switch F. A second reverse stick circuit for relay T, including conductorsfi and 12, is, then completed through contact 25.25 of switch F.

When the manipulation of lever V is in the opposite direction, from the r to the n position,

relay T again opens its contacts 10, 2'7 and 28, and then becomes energized by a reverse pick-up circuit through its special back contact 21. After relay T closes its normal contact 9 the normal energization of relay T is continued by a local stick circuit through contact 8-8? until switch U0 F opens contact 8-8 Switch F then closes its contact 88, thereby completing a second nor mal stick circuit which includes conductors 6 and 12.

In the event of some obstruction preventing switch F from completing its movement in response to a change in direction of energization of relay T, the energization of relay T is continued by the respective stick circuit. A master relay t can then be energized by the return of lever V to its opposite position. Relay it, upon becoming energized, opens its contact 11, breaking the local stick circuit for relay T which, in turn, by opening its contact 27, breaks the circuit for relay t. The pick-up circuit for now energizing relay T is completed through its contact 21. The motor of switch F is then supplied with current for returning switch F to the corresponding position. Switch F may be thus operated back and forth, perhaps in this way causing the obstruction to disappear and permitting the operation of switch F to be completed to the position desired.

A slow pick-up relay N is connected in series with relay T when relay T is supplied with current over wires 6 and 12 by either its normal or its reverse pick-up circuit, or its second normal or its second reverse stick circuit. Relay N when lever V is in its normal position, controls an indicator here shown as an electric lamp e and when lever V is reversed, controls an indicator lamp e The pick-up time of relay N is approximately equal to or greater than the time required for rerelay T to reverse its polar contacts and open its special contact 21. This prevents the lighting of lamp e or e while the respective pick-up circuits for relay T are closed. Lamp e or e is therefore lighted only when the second normal or the second reverse stick circuit, respectively, for relay T is closed;-

A signal relay H is controlled by a lever V Lever V has a position n to the left, a middle position m, and a position r to the right. Lever V as shown in the drawing, is in its m position. Lever V operates two contacts 33 and 58, each of which is closed when lever V is in its n position only; a contact 56 which is closed when lever V is in its m position only; and two contacts 35 and 59, each of which is closed when lever V is in its 1 position only.

Signal relay H is equipped with special contacts 37 and 43 which are similar to contacts 21 and 10, respectively, of switch relay T. Relay H is controlled by pick-up and stick circuits which are, in general, similar respectively, to the pick-up and'stick circuits for relay T.

A relay L is controlled by contacts 54, 52, 49 and 48 of signals S S S and S respectively, in multiple, and is hence energized when any one of these signals is indicating proceed, and is de-energized when all of these signals indicate it t p I).

A master relay h is controlled similarly to relay t by the movement of lever V to its n or its r position. Relay h is also controlled by the movement of lever V to its m position.

Contacts operated by relay L enter into the circuits for relays h and H, similarly in general, to the manner in which contacts operated by switch F enter into the circuits for relays t and T, respectively.

A slow pick-up relay N having a pick-up time which is similar to that of relay N, is controlled similarly to relay N and is connected in series with relay H similarly to the manner in which relay N is connected in series with relay T. Relay N controls indicator lamp 8 or e according as lever V is in its 11 or its 1' position, respectively. Relay H, through its polar contact 47 controls signal S or S according as contact 30--30 or contact 3030 of switch F is closed. Relay H, through its contact 47 controls signal S or signal S according as contact 3131 or contact 3131 of switch F is closed. Circuits for thus controlling signals S S S and S are well known, and are therefore omitted from the drawing.

Lever V and its associated indicator lamps e and c as well as lever V and its associated indicator lamps e and c may be placed with other similar switch and signal control equipment in some central location, such for example, as a train dispatchers offioe. According as lamp e or lamp e is lighted, the dispatcher knows whether switch F is in its normal or its reverse position. When a train enters section AB, contact '7 of relay G opens, causing relay N to be de-energized. Both lamps e and e will then be extinguished, thus indicating to the dispatcher that there is a train in section AB. By noting whether lamp (2 or lamp (2* is lighted, and by noting whether switch lever V is in its 11. or its r position, the dispatcher will know which one, if any, of the signals is indicating proceed.

Sources of current, here shown as batteries Q and Q supply current to the apparatus at points adjacent levers V and V and batteries Q and Q supply current to the apparatus at points adjacent switch F. A battery Q supplies current for operating relay L.

Having thus described, in general, the arrangement, location and operation of the various parts comprising our invention, we will now trace in detail the operation of the apparatus.

As shown in the drawing, all parts are in their normal condition, that is, lever V is in its n position, lever V is in its m position, switch F is in its normal position, each of the signals is indicating stop, and track section AB is unoccupied. Since section AB is unoccupied, relay G is energized. With lever V in its n position and with relay G energized, relay T is energized by its second normal stick circuit passing from battery Q through contact 4 of lever V wire '5, winding of relay N wire 6, contact 7 of relay G, contact 88 of switch F, contacts 9 and 10 of relay T, contact 11 of relay 1., winding of relay T, and wires 12 and 13' to terminal 60 of battery Q With current flowing in this circuit, relay N is energized. With lever V in its n position and with relay N energized, lamp e is'lighted by its circuit passing from battery Q through wires 14 and 15, contact 16 of relay N contact 17 of lever V lamp c and wire 19 to terminal 60 of battery Q If, now the dispatcher desires to reverse switch F, he will move lever V to its 1' position. Contact 10 of relay T then drops, permitting contact 21 of relay T to close and complete the reverse pick-up circuit for relay T passing from battery Q through terminal 66, wires 13 and 12, winding of relay T, contact 11 of relay t, contact 21 of relay T, wire 22, contact '7 of relay G, wire 6,

winding of relay N wire 5, and contact 20 of lever V back to battery Q Relay T now reverses its polar contacts, closing at its contact 9 its first reverse stick circuit passing from battery Q through terminal 44, wire 23, winding of relay T, contact 11 of relay t, contact 10 of relay T, contact 9 of relay T, wire 24, contact 25-25 of switch F. and wire 26 back to battery With polar contact 29 of relay T closed,

Q switch F is operated to its reverse position. Just before reaching the reverse position, switch F opens at its contact 2525 the first reverse stick circuit for relay '1, and then completes through its contact 25-25 the second reverse stick circuit for relay T passing from battery Q through terminal 60, wires 13 and 12, winding of relay T, contact 11 of relay t, contacts 10 and 9 of relay T, wire 24, contact 25--25 of switch F, contact '7 of relay G, wire 6, windin'gof relay N wire 5, and contact 20 of lever V back to battery Q Current flowing in this second reverse stickcircuit for relay T energizes relay N With relay N energized, lamp 2 is lighted by current flowing from battery Q through wires 1 and 15, contact circuit as already traced, and relay T, upon becoming thus energized, completes its first reverse stick circuit as also already traced. If now some obstruction prevents .the completion of the movement of switch F to its reverse position, relay T will continue energized by its first stick circuit.

The dispatcher will now return lever V to its n position, thereby causing relay't to become energized by its pick-up circuit passing from battery Q through contact 4 of lever V wire 5, winding of relay N ,'wire 6, contact '7 of relay G,

wire 22, contact 27 of relay T, winding of relay t,

its contact 27 and so breaks the circuit just traced for relay t. The normal pick-up circuit for relay tery Q T is now completed passing from battery Q through contact 4 of lever V wire 5, winding of relayN wire 6, contact 7 of relay G, wire 22,

contact 21 of relay T, contact 11 of relay t, winding of relay T, and wires 12 and 13 back to bat- Relay T will now close its contact 9*,

"thereby completing its first normal stickcircuit passing from battery Q through contact 8-43 of switch F, contacts 9 and 10 of relay T, contact 11 of relay t, winding of relay'T, and wire 23 back to battery Q With relay T energized in its ing its reverse position has now been removed and that the complete operation of switch F to its reverse position can now be accomplished. If such obstruction has not been removed, as indicated by thefact that lamp 6 does not light, the dispatcher can then repeat the operation of switch F to its normal position and back again toward the reverse position as many times as he desires in his attempt to remove the obstruction in switch F. v

We will next assume that relay T is energized in the reverse direction and that switch F occupies its reverse position, and that in some manner switch F becomes displaced from its reverse position thus breaking at contact 25-25 the second reverse stick circuit for relay T. The first reverse stick circuit for relay T will thereupon be completed at contact 2525 thus tending to cause the return of switch F to its reverse position.

We'will now assume that switch F is again in its normal position, and that the dispatcher dcsires to clear signal 8 He therefore moves lever V to its n position, completing a normal pick-up circuit for relay H passing from battery Q through wires 14 and contact 33 of lever V winding of relay N zwire 36, contact 37 of relay H, contact 38 of relay winding of relay H, and wires 39, 23, 12 and 13 back to battery Q Relay H, upon becoming t. us energized, opens at its contact 37 the pick-up circuit just traced, and completes at its contact 43 its first normal stick circuit passing from battery Q through wire 40, contact l1 of relay H, contact 42' of relay L, contact 43 of relay H, contact 38 of relay h, winding of relay H, and wire 39 back to battery Q With relay H now energized in its normal direction and with switch F in its normal position, the arm of signals will be operated to the proceed position in which it completes through its contact 49 a circuit for relay L passing from battery Q through contact 49 of signal 8 wires 50 and 55, and the winding of relay L back to battery Q Relay L, upon becoming energized, opens at its contact 42' the first normal stick circuit which has been already traced for relay H, and completes at its contact 42 the second normal stick circuit for relay H passing from battery Q through wires 14 and 32, contact 33 of lever V winding of relay N wire 36, contact 42 of relay L, contact 43 of relay H, contact 38 of relay h, winding of relay H, and Wires 39, 23, 12 and 13 back to battery Q Current iiowing, in the sec-- c-nd normal stick circuit for relay H causes relay N to close its contact 57, thereby completing the lighting circuit forv lamp e passing from battery Q through wires 14 and 32, contact .57 of relay N contact 58 or" lever V lamp e andwire 19 back to battery Q 7 If, when the dispatcher has moved lever V to its 12 position, lamp c has not lighted, the dispatcherknows signal S has not responded. Relay L is therefore still deenergized, and relay H is still energized by its first normal stick circuit. The dispatcher can now return lever V to its 11:. position, therebycompleting a'pick-up circuit for relay h passing from battery Q through wire 40, contact 41 of relay H, contact 42* of relay L, contact'45 of relay H, winding of relay h, wire36, winding of relay N contact 56 of lever V and wires 12 and 23 back to battery Q Relay h, upon becoming energized, opens its contact 38 thus breaking the first stick circuit for relay H which then, upon becoming tie-energized, opens its contact 45 causing relay h to be de-energized, The dispatcher can, if he desires, now again move lever V to the 12 position in a further attempt to clear signal S We will assume that the dispatcher has succeeded in clearing signal S andhas left lever V in its n position for holding the arm of signal S in the proceed position. We will also. assume that, for some reason, the arm of signal S drops from its proceed position, causing relay L to be come de-energized. With relay L de-energized, the second normal stick circuit for relay H is broken at contact 42 of relay L, and the first normal stick circuit for relay H is again completed at contact 42 of relay L. Relay N is new de-energized and hence lamp e is extinguished, thus indicating to the dispatcher that signal S has ceased to display the proceed indication.

In order to clear signal S the dispatcher will move lever V to its 1' position, completing the reverse pick-up circuit for relay I-I passing from battery Q through wires 13, 12, 23 and 39, winding of relay H, contact 38 of relay h, contact 37 of relay H, wire 36, winding of relay N contact 35 of lever V and wire 34 back to battery Q Relay H is now energized in the reverse direction and hence closes its contact 41*, thereby completing its first reverse stick circuit passing from battery Q through wire 39, winding of relay H, contact 38 of relay h, contact 43 of relay H, contact 12 of relay L, and contact 41 of relay H, back to battery Q With contact 47 of relay H now closed and with contact 3l--3l of switch F closed, the arm of signal S will be moved to the proceed position.

When the arm of signal S reaches the proceed position, relay L becomes energized by its circuit passing from battery Q through wires 51 and 53, contact 54 of signal S and the winding of relay L back to battery Q The second reverse stick circuit for relay H is new completed passing from battery Q through wires 13, 12, 23 and 39, winding of relay H, contact 38 of relay h, contact 43 of relay H, contact 42 of relay L, wire 36, winding of relay N contact of lever V and wire 34 back to battery Q Relay N is therefore energized and completes the lighting circuit for lamp e passing from battery Q through wires 14 and 32, contact 57 of relay N contact 59 of lever V lamp c and wire 19 back to battery Q It will be noted from the foregoing that in apparatus comprising our invention a light is constantly displayed when switch F occupies its normal position, and a second light is constantly displayed when switch F occupies its reverseposition'. It will also be noted that a light is constantly displayed when one of the eastbound signals is indicating proceed, and that a second light will be constantly displayed when one of the westbound signals is indicating proceed.

Although we have herein shown and-described only one form of apparatus embodying our invention, it is understood that various changes and 1 modifications may be made therein Within the scope of the appended claims without departing from the spirit and scope of our invention.

Having thus described our invention, what we claim is:

1. In combination, a railway traiiic governing device, a relay for controlling said'device, a back contact for said relay which when said relay becomes energized continues closed until after the front contacts operated by said relay have closed, a pick-up circuit for said relay controlled by said back contact, and a stick circuit for said relay controlled by said device.

2. In combination, a railway traffic governing device, a stick relayfcr controlling said device, a manually operable device, a pick-up circuit'for said relay controlled by said manually operable device, a stick circuit for said relay controlled by said governing device, and a second stick circuit for said relay controlled by said manually operable device.

3. In combination, a railway traffic governing device, a polarized relay for controlling said device, a normal pick-up circuit for said relay controlled by one of its own neutral back contacts, a reverse pick-up circuit for said relay, and a stick circuit for said relay controlled by a polar contact of said relay and by said device.

4. In combination, a polarized relay for controlling a railway traffic governing device, a slow vice, a slow pick-up relay, a normal pick-up circuit for said polarized relay including said slow pick-up relay in series with said polarized relay, a stick circuit for said polarized relay controlled by said device, and indication means controlled by said slow pick-up relay.

6. In combination, a railway traflic governing device, a relay for controlling said device, a manually operable lever, means controlled by said lever for. energizing said relay, means controlled by said relay for transferring the control of said relay from said lever to said device, and means controlled by said lever for restoring the control of said relay to said lever.

7. In combination, a railway trafiic governing device, a relay for controlling said device, a manually operable lever, means controlled by said lever for energizing said relay, and means controlled by said device for transferring the control of said relay from said lever to said device when said device is moved without a corresponding movement of said lever.

8. In combination, a railway track switch, a switch contact which is closed at all times except while said switch is in its reverse position, a polarized relay, a pick-up circuit for supplying said relay with current of normal or reverse polarity, a reverse stick circuit for said relay including said switch contact and a reverse polar contact of said relay in series, and means for operating said switch to its normal or its reverse position according as said relay is energized in the normal or the reverse direction. 7

9. In combination, a railway track switch, a switch contact which is closed at all times except While said switch is in its reverse position, a polarized relay, a master relay, a pick-up circuit for energizing said polarized relay in the normal or the reverse direction, a reverse stick circuit for said polarized relay including a back contact of said master relay and a front neutral and a reverse polar contact of said polarized relay as well as said switch contact in series, a circuit for said master relay including a front neutral and a reverse polar contact of said polarized relay as well as said switch contact in series, and means for operating said switch to its normal or its reverse position according as said polarized relay is energized in closed until after the front neutral contacts operated by said relay have closed, a master relay, a pick-up circuit for said polarized relay including its said back contact, a reverse stick circuit for said polarized relay including a back contact of said master relay and a front neutral and a reverse polar contact of said polarized relay as well as said switch contact in series, a circuit for said master relay including a front neutral and a reverse polar contact of said polarized relay as well as said switch contact in series, and means for operating said switch to its normal or its reverse position according as said polarized relay is energized in the normal or the reverse direction.

11. In combination, a railway track switch, a normal switch contact which closed while said switch is in its normal position only, a second normal switch contact which is closed at all times except while said switch is in its reverse position, a reverse switch contact which is closed while said switch is in its reverse position only, a second reverse switch contact which is closed at all times except while said switch is in its normal position, a polarized switch relay having a back neutral contact which when said relay becomes energized continues closed until after the front neutral contacts operated by said relay have closed, amanually operable lever, a pair of conductors, a pick-up circuit for said switch relay including said conductors and said switch relay back contact as well as the winding of said switch relay in series, a normal stick circuit for said switch relay including a source of current and said second reverse switch contact as well as a normal polar and a neutral front contact of said swich relay and the winding of said switch relay in series, a reverse stick circuit for said switch relay including a source of current and said second normal switch contact as well as a reverse polar and a front neutral contact of said switch relay and the winding ofsaid switch relay in series, a second normal stick circuit for said switch relay including said conductors and said first normal switch contact as well as a normal polar and a front neutral contact of said switch relay and the winding of said switch relay in series, a second reverse stick circuit for said switch relay including said conductors and said first'reverse switch contact as well as a reverse polar and a front neutral contact of said switch relay and the winding of said switch relay in series, means controlled by said lever for supplying said conductors with current of normal or reverse polarity, and means for operating said switch to its normal or its reverse position according as said switch relay is energized in the normal or the reverse direction.

12. In combination, a railway track switch, a normal switch contact which is closed at all times except while said switch is in its reverse position,

"a reverse switch contact which is closed at all times except while said switch is in its normal position, a polarized switch relay, a manually operable lever, a master re1ay, a pick-up circuit for said switch relay controlled by said lever, a stick circuit for said switch relay including a source of current and said normal switch contact as well as a reverse polar contact of said switch relay and a back contact of said master relay and the winding of said switch relay in series, a second stick,

circuit for said switch relay including a source of current and said reverse switchcontact as well as a normal polar contact of said switch relay and a back contact of said master relay and the winding of said switch relay in series, a circuit for said master relay including a source of current and said'nor'inal switch contact as well as a reverse polar and a front neutral contact of said switch relay and a normal contact of said lever and the winding of said master relay in series, a second circuit for said mast r relay including a source of current and said reverse switch contact as well as a normal polar and a front neutral contact of said switch relay and a reverse contact of said lever and the winding of said master relay in series, and means for operating said switch to its normal or its reverse position according as said switch relay is energized in the normal or the reverse direction.

13. In combination, a railway track switch, a normal switch contact which is closed while said switch is in its normal position only, a reverse switch contact which is closed while said switch is in its reverse position only, a polarized switch relay, aslow pick-up relay the pick-up time of which is approximately equal to or greater than, the time required for said polarized switchrelay.

relay and continuing the energization of said switch relay including the windings of said slow pick-up relay and said switch relay as well as said normal switch contact and a normal polar and front neutral contact of said switch relay and a source of current, a second circuit for energizing said slow pick-up relay and continuing the energization of said switch relay including the windings of said slow pick up relay and said switch relay as well as said reverse switch contact and a reverse polar and front neutral contact of said switch relay and a source of current, means for operating said switch to its normal or its reverse position according as said polarized switch relay is energized in the normal or the reverse direction, and indication means controlled by said slow pick-up relay.

14. In combination, a railway signal, a control relay for said signal, a pick-up circuit for said relay controlled by a back contact of said relay, a stick circuit for said relay closed when said signal indicates other than proceed, and a second stick circuit for said relay closed when said signal indicates proceed.

15. In combination, a first and a second railway signal, a polarized signalrelay, a pick-up circuit for said relay controlled by one of its own back contacts, a normal stick circuit for said relay controlled by one of its own normal polar contacts and energized only when said signals indicate other than proceed, a reverse stick circuit for said relay controlled by one of its reverse polar contacts and energized only when said signals indicate other than proceed, a second normal and a second reverse stick circuit for said relay each energized only when one of said signals indicates proceed, and means for causing said first or said second signal to indicate proceed according as said signal relay is energized in the normal or the reverse direction.

16. In combination, a railway signal, a control relay for said signal, a pick-up circuit for said relay, a master relay, a stick circuit for said control relay including a back contact of said master relay and which can be completed only when said signal indicates other than proceed, a manually operable device, and means controlled by said manually operable device for energizing said master relay only when said control relay is energized and said signal indicates other than proceed.

17. In combination, a first and a second railway signal, a polarized relay, a slow pick-up relay the pick-up time of which is approximately equal to or greater than the time required for said polarized relay to reverse its polar contacts and close its front neutral contacts, a pick-up circuit for" said polarized relay, a circuit for energizing said slow pick-up relay and for continuing the energization of said polarized relay and including the windings of said two relays and completed only when one of said signals indicates proceed, means for causing said first or said second signal to indicate proceed according as said polarized relay is energized in the normal or the reverse direction, and indication means controlled by said slow pick-up relay.

18. In combination, a railway traffic governing device, a pair of conductors, means for at times supplying said conductors with current for controlling the operation of said device, an indication means, and means controlled by said governing device for supplying current of the same character as said device control current to said conductors for causing said'indication means to display a constant indication of the condition of said device.

19. In combination, a railway track switch, a signal for governing traific movements over said switch, a first and a second control wire and a common wire extending from a remote point to a point adjacent said switch and said signal, a manually controlled circuit including said common wire and the first of said control wires for controlling said switch, a switch indication device, a circuit controlled by said switch and including said common wire and said first control wire for causing said switch indication device to display a constant indication of the condition of said switch, a manually controlled circuit including said common wire and the second of said control wires for controlling said signal, a signal indication device, and a circuit controlled by said signal and including said common wire and said second control wire for causing said signal indication device to'display a constant indication of the condition of said signal. l

20. In combination, a railway trafiic governing device operable to a first or a second condition, a polarized relay, means controlled by said polarized relay for operating said governing device to its first or its second condition according as said polarized relay is energized by current of one polarity or the other, a normal and a reverse responds to said polarized relay, a second normaland a second reverse stick circuit for said polarized relay including said slow pick-up relay and closed when said traffic governing device responds to an operation of said polarized relay, and indication means controlled by said slow pick-up relay for indicating the condition of said traflic governing device.

21. In combination, a railway track switch, a-

polarized control relay, means controlled by said relay for operating said switch to the normal or the reverse position according as said relay is energized by current of normal or of reverse polarity, a normal and a reverse pick-up circuit for said relay each or" which is manually controlled, a normal and a reverse stick circuit for said relay each of which becomes closed when said switch responds to the corresponding energization of said relay, and indication means which becomes operated upon the lapse of a measured period of time after either of said stick circuits becomes closed.

22. In combination, a stretch of railway track, a polarized relay, trafiic governing means controlled by said relay for governing a first or a second traiTic movement through said stretch according as said relay is energized in the normal or the reverse direction, a pair of conductors, a manually controlled circuit including said conductors for energizing said relay the normal or the reverse direction, an indication instrument, and a second circuit including said conductors and controlled by said traffic governing means for operating said instrument upon the lapse of a measured period of time after said trafiic governing means becomes controlled by said relay and for constantly retaining said instrument in said operated condition.

JOHN M. PELIKAN.

CHARLES A. BROOKS.

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