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On trains, the expression emergency brake has several meanings: * The ''maximum'' brake force available to the driver/engineer from his conventional braking system, usually operated by taking the brake handle to its furthest position, through a gate mechanism, or by pushing a separate plunger in the cab. * A completely separate mechanism from the conventional braking system, designed to stop the train as quickly as possible. * A handle or plunger which may be applied by a passenger in an emergency situation, either stopping the train directly or sending an alarm to the driver so that he can stop the train. The emergency brake applies considerably more braking force than the standard full-service brake. The engineer, motorman or driver will only use the emergency brake as a last resort, since it may cause damage; even with modern wheel slide protection, a train may develop wheel-flats, and the rails themselves can suffer profile damage. ==Possible consequences of operation== Putting the engineer's brake handle into the emergency position may also: *Shut off traction power *On an electric train, drop the pantograph if the power supply is overhead-wire traction current, or raise the pickup shoes where the supply is third-rail traction current *Disable dynamic braking *Prevent the brakes from being released until the train has stopped *Connect the brake wires to ground, to prevent a "false-feed" voltage from releasing the brakes *Send an emergency radio signal, if the brake handle has been in the emergency position for over 30 seconds 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Emergency brake (train)」の詳細全文を読む スポンサード リンク
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