Using a back-to-back gauge for your model railway ensures that the wheels on your rolling stock are spaced correctly...
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How do I use a back to back gauge?Read more -
What is a poly-cap?Read moreA poly-cap is a type of plastic cap often used in model-making kits, especially for assembling figurines or model...
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What is Graham Farish?Read moreGraham Farish is a name you’re likely to come across if you're interested in British model railways, especially in...
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When did semaphore signals stop being used in the UK?Read moreSemaphore signals, those distinctive mechanical arms that once graced railway lines across the UK, were largely...
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What is Kato track?Read moreKato track is a popular choice in the world of model railways, known for its quality, ease of use and versatility. If...
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.
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