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Track Circuit Diagram

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TRACK CIRCUIT OPERATION

Railway safety systems are in many cases based on track circuits. The track is divided in electrical sections. In each section a signal transmitter [1] is connected to the rails [2] on one end.  A signal receiver [3] is connected on the other end. When no train is present the receiver can detect the signal that is applied to the rails by the transmitter. The wayside signal indicates non-occupancy of the track circuit. It shows green. When a train is present, the electrically conductive axles of the train short circuit the running rails. The signal from the transmitter can no longer be detected by the receiver. The way-side signal now shows that the track circuit is occupied. It switches from green to red.

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