TRACK CIRCUIT Russian patent published in 2007 - IPC B61L23/16 

FIELD: railway transport; signaling and communication.

SUBSTANCE: invention relates to voice track circuits. Proposed track circuit has signal frequency generator, communication line, two transformers, rail lines signal frequency filter, rectifier, smoothing filter, analog-to-digital converter, OR logic gate, receiver. And it is furnished additionally with first, second, third, found and fifth resonance oscillatory circuits. Signal frequency generator is connected by communication line with track section transformer box instruments and station instruments. Checking of condition of track circuit is provided by track relays which are connected in turn to rail lines to connect track generator to rail lines.

EFFECT: improved reliability of operation of track circuit owing to considerable reduction of use of cable core for connecting track transformers with generators and track receivers.

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