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What is a 'tripcock test indicator'?
A 'tripcock' is a piece of safety equipment on a train comprising an arm that protrudes to make physical contact with a 'trainstop' (a piece of lineside equipment set at the same height as the tripcock) as the train passes. If contact is made between a tripcock and a trainstop, the train's brakes are automatically applied. Trainstops are typically located prior to signals and are raised into position when the signal shows danger.
A 'tripcock test indicator' is a sign that can be seen by the trackside of some DC electric railway lines just before a section of track equipped with trainstops. A tripcock test indicator's function is to be triggered by a passing train to test that its tripcocks are set to the correct height to be triggered by a trainstop on the line ahead. When activated, a tripcock test indicator will illuminate with a double 'T' momentarily until being extinguished by a second detector.
During a test, should the sign fail to be illuminated and extinguished in an expected pattern, train crews must assume that the tripcocks are not functioning properly and appropriate action should be taken.
Posted in: Model Railway
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