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Track circuit interrupter

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A track circuit interrupter may be fitted at catch points, trap points or buffer stops to maintain a track circuit in the 'occupied' state in the event of a derailment. The track circuit remains de-energised until the interrupter is replaced.

GK/RT0011 specifies the requirements for the provision of track circuit interrupters. ^[1]

Interrupter drawn as two filled triangles. Assume train has overrun 53 signal and 52A trap points and interrupter shows DBT T.C. on Down Line as blocked (twin red lights).

References

↑ GK/RT0064: Provision of Overlaps, Flank Protection and Trapping Archived 2007-12-11 at the Wayback Machine

v t e Railway signalling
Block systems	Absolute block signalling Automatic block signaling Centralized traffic control Communications-based train control Direct traffic control European Train Control System Moving block Radio Electronic Token Block Token Track Warrant Control Train order operation
Signalling control	Block post Integrated Electronic Control Centre Interlocking Lever frame Rail operating centre Solid State Interlocking Westlock Interlocking
Signals	Application of railway signals Cab signalling North American railroad signals Railway semaphore signal
Train detection	Axle counter Track circuit Track circuit interrupter Treadle
Train protection	Advanced Civil Speed Enforcement System ALSN ASFA ATACS ATMS Automatic train control Automatic train operation Automatic train protection Automatic Train Protection (United Kingdom) Automatic train stop Automatic Warning System Automatische treinbeïnvloeding Balise Catch points Chinese Train Control System Cityflo 650 CBTC Continuous Automatic Warning System Contrôle de vitesse par balises EBICAB IIATS Integra-Signum Interoperable Communications Based Signaling Crocodile Korean Train Control System Linienzugbeeinflussung Positive Train Control Pulse code cab signaling Punktförmige Zugbeeinflussung RS4 Codici SelTrac Sistema Controllo Marcia Treno SACEM Slide fence Train automatic stopping controller TMACS Train Protection & Warning System Train stop Trainguard MT Transmission balise-locomotive Transmission voie-machine
Crossing signals	Level crossing signals Crossbuck Wigwag E-signal Wayside horn
Manufacturers	Adtranz Alstom AŽD Praha Federal General Electric GRS Griswold Hall Hitachi Hyundai Rotem Magnetic Progress Rail Safetran Saxby Siemens Smith and Yardley Thales Union Switch Westinghouse Brake & Signal Westinghouse Rail Systems
Organisations	AAR AREMA ERA FRA HMRI IRSE Transport Canada UIC
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