DANGER SIGNAL PASS PREVENTING DEVICE Russian patent published in 2002 - IPC

FIELD: railway signaling and communication. SUBSTANCE: invention is designed for use in train traffic control systems. Proposed device has code track circuit, transmitter relay closing circuit, decoder closing circuit and control and closing relays. Common contact of control relay is connected to transmitter relay winding terminal, and front and resting contacts are connected with contacts of three plates of code track transmitter and plus pole of supply source. Resting contact of first t-piece of yellow light relay is connected to front contact of impulse track relay through first diode, and pulse pole of supply source is connected to front contact of yellow light relay t-piece, and terminal of control relay winding is connected to common contact. Resting contact of second t-piece of yellow light relay is connected to resting contact of impulse track relay through second diode, to front contact of second t-piece of yellow light relay plus pole of supply source is connected, and to common contact, closing relay winding terminal. Trail tail carries two red light signals. EFFECT: improved reliability and safety owing to provision of protective section and dispensing with line wires. 1 dwg