TRACK CIRCUIT Russian patent published in 1997 - IPC

FIELD: railway transport; traffic control systems. SUBSTANCE: track circuit has signal shaping and receiving units 1 whose first output and input are connected, respectively, to input and output of rail line 2. Second output, through threshold element 3, forms output of track circuit. It has also phase difference measuring unit 4. First and second inputs and outputs of phase difference measuring unit 4 are connected, respectively, to first and second information outputs and to control input of signal shaping and receiving unit 1. EFFECT: enhanced reliability of operation. 1 dwg