FIELD: railway transport; control of trains at stations and on route. SUBSTANCE: track circuit has line 1, resistor 2, univibrator 3, transmitter 4, control duty setting unit 5, delay element 6, function generator 7, track relay 8 with contact 8.1, track receiver 9, pulse shaper 10 and R-S flip-flop. EFFECT: enhanced reliability of control. 1 dwg
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