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Triple ValveThe operation of the brake on each vehicle is controlled by the " triple valve", so called because it has three functions - to release the brake, to apply it and to hold it at the current level of application.
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KICKER" Triple valve in defective order, which throws air brakes into emergency when only a service application is intended, or sometimes by a bump of the train ...
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Also called a triple valve ABD Valve An improvement of the AB Valve that features a quick release. ABDW Valve An improvement of the ABD Valve.
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 See also: Train, Locomotive, Operation, Signal, Freight car
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