tripcock
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English
Etymology
Noun
tripcock (plural tripcocks)
- (rail transport) A train-mounted safety device which interacts with a trackside device to stop a train automatically if it passes a signal at danger (showing a red light).
- 2012, Andrew Martin, Underground Overground: A passenger's history of the Tube, Profile Books, →ISBN, pages 136–137:
- When a train runs onto the track, thus connecting the two rails, a short circuit is created, the current drops out and the signal switched to red. The system operates in conjunction with a lever on the tracks. If a train should pass a red light, the lever, which is called a tripcock, comes into play. The tripcock releases the air from the train's air-braking system, thus causing the brakes to come on and stopping the train.
- 2020 July 1, Richard Clinnick, “Network News: '165' runs through points and into path of LU service”, in Rail, page 20:
- Chiltern Class 165s are fitted with tripcocks to allow them to operate on LU infrastructure between Harrow-on-the-Hill and Amersham.