Triple Valve
The 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.
Triple Valve
An operating valve for charging the reservoir and applying and releasing the brake.
Trolley ...
Triple valve in defective order which throws airbrakes into emergency when service application is intended.
King
Yardmaster or freight conductor.
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.
The operating device used on freight cars for charging, applying, and releasing the brakes. Also known as a triple valve.
Abandon
When a railroad ceases operation over a route with no intention of resuming service.
 See also: Train, Locomotive, Operation, Signal, Freight car
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