What kinds of track circuits are used by IR?

16-07-2019

The most common form of track circuit used is the detection of a train by the closing of an electrical circuit between the two rails because of the conducting nature of the rolling stock. This circuit may use DC in the simplest form, or may use AC, at various frequencies or with coded pulses. DC Track Circuit (double-rail) Double-rail DC track circuits are generally found only in non-electrified sections, and only where there is no concern with stray currents circulating in the earth or in the rails. The track circuit consists of a portion of the track which is insulated from the rest of the track by means of insulated rail joints. Within the section so insulated, bonding wires are

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