341,115. Electric selective control apparatus for railway signalling &c. WESTINGHOUSE BRAKE & SAXBY SIGNAL CO., Ltd., 82, York Road, King's Cross, London.-(Assignees of Thompson, H. A. ; 311, W. Swissvale Avenue, Edgewood, Pennsylvannia, U.S.A.) Oct. 15, 1929, No. 31284. Convention date, Oct. 20, 1928. [Class 105.] In an electric control apparatus for a number of electrically controlled devices required to be operated in partly inter-inclusive groups, such as railway points and signals required to be set for a given direction and route of traffic, the setting is effected by a single lever which, providing that conflicting control relays are not energized, energizes a control or route relay to supply current through relay contacts to all the devices required to be set. When a lever is moved to its reverse position a route relay g is energized, providing no conflicting route relay is energized. The route relay g closes contacts to energize the required first points-control relays P and polarized first signal-control relays U. The relays P cause second points-control relays m to be picked up and held over a stick circuit ; contacts of relays m effect the points operation. The relays U cause polarized second signal-control relays Q to be energized to operate the signals. The signal circuits and pointsrelays m circuits include track relay contacts T and points-indicator relay contacts, i, t. Figs. 1 .. 3 illustrate the arrangements for a double track railway with a cross-over and a double branch track. Fig. 4 shows a panel with lamps for indicating the position of the points, de-rails, and signals, and with the operating levers to effect the required setting. Main signals S<1>, S<3>, S' with call-on arms are provided for the normal directions of traffic and dwarf signals S<2>, S<4>, S<6> for traffic in the reverse directions. De-rails are provided. The points and de-rails are actuated by electric motors such as M<5> the mechanical circuit-controllers b<5> of which effect the energization of polarized switch-indicator relays h<1> .. h<5> ; the motors are controlled by polarized points-control relays m<1> .. m<5>, Fig. 3. The signals are controlled by polarized relays U<1>, U<2>, Fig. 2, which respectively energize polarized relays Q<1>, Q<2>, Fig. 3. The points-control relays m<1> .. m<5> are energized over contacts such as 120n<2>, 121n<1> of relays n<1>, n<2> which can only be energized if the signals are at " stop " as their circuits include contacts 144N<1>, 146N<2> of signal relays N<1>, N<2> energized over contacts such as 26, 27 closed by the signal arms in the stop position. At normal the points are as shown, the de-rails open and the signals at "stop"; the pointscontrol and points-indicator relays m<1> .. m<5>, h<1> .. h<5> are energized in the normal sense and incidentally energize normal indication-relays il .. i<5>. The relays n<1>, n<2> are energized, the circuit for relay n<1> being from x over contact 143 of relay Q<1> at neutral and contact 144N<1> through the winding to o, Fig. 3. To send a train in the direction ED, the panel lever " to D " is moved to close a contact KED, Fig. 2, whereby a route relay g<5> is energized, the circuit being from transformer 199 over back contacts 200g<2>, 201r<2>, 202g<3>, 203r<3>, 204g<6>, 205r<6>, contact KED, winding of the relay, back contact 268r<5> to the transformer. This action energizes a points-control relay P<5> over contact 257g<5> which causes the reverse energization of polarized pointscontrol relay m<5>, the circuit being, Fig. 3, from x over contacts 116T3, 117V<1>, 133n<2>, 136i4, 137t<5>, front contact 138P<5>, through the winding 41 and front contact 135P<5> to o ; the relay is then held by a stick circuit over front contact 141P<5>, reverse contact 142, winding 41 and front contact 135P<5>. The de-rail H<5> is thus put to reverse (preparing the track) by the energization of points motor M<5> from the battery L over reverse contacts 333m<5> and 338m<5> ; the polarized indicator relay h<5> is reversely energized at the completion of the points movement by the mechanical movement of contact arms 30, 31. The reverse indication relay t<5>, Fig. 3, is now energized over reverse contacts 65m<5> and 67h<5> and lights a reverse indication lamp e<3> for the de-rail H5, the normal indication lamp e<2> being extinguished by the de-energization of normal indication relay i<5>. The signals are also actuated by the energization of route relay g<5> which causes the reverse energization of relay U<2> over contact 247g<5> for winding 41 and over contact 282g<5> from the end 285 of transformer f for winding 40. This energizes polarized signal relay Q<2> reversely over contacts 169t<5>, 170i<3>, reverse contact 172U<2>, winding 41 and reverse contact 168U<2> to o, so that the arm a<5> of signal S<5> is actuated over reverse contact 287Q<2>, contacts 288i<3>, 289t<5>, 290i<4>, reverse contact 291Q<2>, 292J<2>, back contact 293R<2>, contacts 294T<3>, 295T<2>, 296i<3>, and 297T<1>. The signal arm a<5> drops to the 45‹ position and, if a track relay T<1> is energized normally, the arm a<5> is further moved to the 90‹ position by current over normal contact 28 of relay T<1>. On the panel a green or yellow lamp is lit over contact 349g<5> and normal or reverse contact 350T<1>. The dropping of the signal arm breaks the circuit for relay N<2> and therefore relay n2 cannot be energized until route relay g<5> is deenergized to de-energize relays U<2> and Q<2>. An approaching train de-energizes a track relay T<4>, a contact 228T<4> of which closes a stick circuit so that route relay g<5> remains energized even if the route lever is put back to normal ; the stick circuit comprises back contact 228T<4>, front contact 227T<3> and a slow-release contact 226J<2> across the contacts of the route lever. A quick-release contact 292J<2> of a manually operated device breaks the signal circuit to enable the train to be held at the signal while the slow-release contact prevents the de-rail H<5> returning to normal until the train has entered the section. If the train passes through, a track relay T3 opens the contact 294T<3> to put the signal to stop. Track relays T3, T<6>, T8 are picked up over back contacts of the route relays and so cannot be restored to action until the route levers are put back to normal for example, T<3> is picked up over back contacts 10g<2> and 11g<5> and is held over its own contact 9. The energization of track relay T<1> is reversed by a pole-changer 6 operated by a signal G. Route-locking relays are provided V<1>, V<2> for East-bound and W<1>, W<2> for West-bound traffic ; the relay W<2> for example, is de-energized when contact 48T<3> drops due to the passage of a train short-circuiting the track relay T3 (contact 51Q<2> being open as relay Q<2> is reversely energized) and by opening its contact 102W<2> prevents the signalman energizing points-control relay m<3> to alter the switch H<3>. Further, points-control relay m<5> cannot be restored to normal while contact 116T3 is open. A " call-on " lever on the panel closes a contact KE to energize a relay R<2> so that a call-on arm a' of the signal S<5> may be lowered by a circuit over front contact 293R2. A stick circuit over contact 177g<5> maintains relay R<2> energized. A panel indicator lamp is lit over contact 352R<2>. To send a train in the direction EB, the panel lever " to B " is moved to energize route relay g<2> which energizes, over contacts 255g<2>, 241g<2>, 353g<2>, relays P<5>, P<3>, P<1> to put points-control relays m<5>, m<3>, m<1> to reverse and therefore de-rails H<5>, H<1>a and switches H3, H<1> to reverse, relay m3 not being reversed until a contact 109t<1> is closed after operation of switch H<1> and the consequent energization of reverse indication relay t<1>. The polarized signal relay U<2> is reversely energized by circuits over contacts 245g<2> and 281g<2>, and the relay Q<2> reversely energized over contacts 169t<5>, 171t<3> so that the branch signal arm a<6> is now dropped by current over contacts 310Q<2>, 308t<3>, 289t<5>, 290i<4>, reverse contact 291Q<2>, 292J<2> back contact 293R<2>, 294T<3>, 295T<2> and 298t<3>. Specification 194,653, [Class 38 (iv), Electric supply and transmission systems &c.], is referred to.