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Air Brakes and Train Handling Rules - Alaska Railroad

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67 Car Equipment <strong>and</strong> ComponentsThreadedplugQuick servicevalve portionVent valve portionQuick servicevolume exhaustVent protectorFigure 67-H. A-1 Reduction Relay Valve.The relay valve functions as follows:• Service brake reductions are assisted through the A-1 quickservice portion.• Emergency brake pipe reductions are transmitted by the No. 8vent valve portion.If the No. 8 vent valve fails to reset after an emergency brake application,causing a continuous blow at the exhaust port, plug the valveby removing the vent protector <strong>and</strong> screwing in the threaded plug.67-14 ARRC <strong>Air</strong> <strong>Brakes</strong> <strong>and</strong> <strong>Train</strong> H<strong>and</strong>ling Manual June 1, 1996

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