TRAFFIC CONTROL DEVICE Russian patent published in 1997 - IPC

FIELD: railway transport; signalling track occupancy checking. SUBSTANCE: device has voice frequency track circuits, each including signal generator 1, track filters 2, receivers 12 and 14 with track relays 13, 15, matching transformers 5,10,11, capacitors 4,16, resistors 3,17,19. Secondary windings of matching transformers 10, 11 of relay ends of adjacent track circuits 6,7 are interconnected by one terminal to which one lead of series- connected input circuits of receivers 12, 14 is connected. Second lead of secondary windings of above-indicated transformers 10, 11 is connected through resistor 19 to second terminal of series-connected input circuits of signal receivers 12, 14 of adjacent track circuits. EFFECT: improved reliability of traffic control. 1 dwg