Track circuit
Videos
A track circuit is an electrical device used to prove the absence of a train on a block of rail tracks to control railway signals. An alternative to track circuits are axle counters.
Illustration of track circuit invented by William Robinson in 1872
Track circuit transformer on the right, new axle counter on the left (Slovenia).
Tuning unit of a ZPW-2000 (Chinese variant of UW71) track circuit and a sign indicating "do not stop at circuit boundary", where loss-of-shunt may occur.
Data pickup unit CSEE; end view
Axle counter
Videos
An axle counter is a system used in railway signalling to detect the clear or occupied status of a specified section of track. The system generally consists of a wheel sensor and an evaluation unit fo
An axle counter detection point in the UK
Axle counter for automatic railway crossing (Slovenia)