Patent GB-376859-A (GB)
Title: System for preventing collisions on railways
IPC: B61L3/08
Filed: 1931-04-27
Abstract: 376,859. Train control systems. SEYBOLD, R., Faurndau, near G÷ppingen, Wurtemberg, Germany. April 27, 1931, No. 12400. [Class 105.] In a train control system comprising abutments arranged along the section between two stations which are raised into position to engage locomotive apparatus, all the abutments which would affect a train travelling in the opposite direction and one abutment which would affect an overtaking train and situated at the rear of the section are connected up in a circuit which is closed at a contact X when the train enters the section ; the abutments are withdrawn when the train passes an exit contact Y so disposed as to be engaged only by an endcarriage contact so that the section is protected if the train should become uncoupled. The system is arranged to permit travel in both directions by providing abutments at both sides of the track, the locomotive contact being arranged at the right-hand side. A train entering the section A, B, Fig. 3, at station A actuates a track contact X<1> to close a circuit whereby all the abutments F<1> which would give' a control effect on an oncoming train travelling from B to A, and an abutment F<1> to the rear of station A which would give a control effect on a following train are raised into the active position. When the train leaves the section the track contact Y is actuated, for example, by an end-carriage contact to close a circuit whereby the above abutments are withdrawn. Should an oppositely travelling train enter the section A, B at B, as indicated in Fig. 4, this latter train causes the abutments F<2> to be raised and both trains will thus be stopped. The construction and wiring arrangements for one abutment are shown in Fig. 1. The abutment a is raised into the active position and withdrawn by the alternate energization of solenoids i<1>, i<2> the common core h of which has a rack engaging a toothed sector to rotate the abutment a about a.horizontal axle. An electrically operated locking latch k normally engages one or other of notches h<1>, h<2> in the rack. When a train enters the section the contact X is temporarily closed to complete a circuit from the positive supply line through wire 12, magnet i3 of the locking latch k, wire 13, contact p, o, p which is closed when the points lever is in its end position, the abutment-raising solenoid i<1>, and closed contact X to the negative supply line. When the train leaves the section the contact Y is temporarily closed to complete a circuit from the positive line through the magnet i<3> of the locking latch k, wires 13, 21, contact Y, wire 22, and the abutment-withdrawing solenoid i<2> to the negative line. Should the points lever be moved over at any time, during its movement it momentarily closes a contact t, 19 arranged in parallel with the contact Y so that the abutments are withdrawn. In the event of any accident the section can be blocked by operating manual switches Z<1> on the telegraph poles. 'These switches lie in parallel with the contact X. Similar manual switches Z<2> in parallel with contact Y enable the section to be signalled clear. When the points lever is moved to put the points at reverse a contact such as p, o, p includes in circuit the abutments required for the new route together with the abutments flanking the cross-over.