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The Driver's Reminder Appliance (DRA) is a manual switch in the driving cab of a passenger train. When operated it glows bright red and prevents the driver from being able to take power.〔(functional requirements ) at rgsonline.co.uk〕 It was introduced in the design and operation of United Kingdom passenger trains in the 1990s〔(original requirements for DRA ) at rgsonline.co.uk〕 in response to a series of railway accidents where train drivers had passed a signal at danger when starting away from a station.〔http://www.hse.gov.uk/research/crr_pdf/2001/crr01334.pdf accident investigations including evaluation of DRA〕 == Operation == Use of the DRA is mandatory〔(operational requirements (section 10.3) ) at rgsonline.co.uk〕 for drivers of British passenger trains and they are required by the Drivers' Rule Book to set it: * when closing down, entering or leaving the cab * when the train is stopped at a red signal * when the train is stopped after passing a signal displaying a single yellow (caution) aspect The DRA must only be reset: * when the driver has authority to start the train * when the signal has cleared to a proceed aspect or in the case of stopping when a cautionary aspect had been passed can be reset to proceed towards the next signal but serves as a reminder that the driver may be approaching a stop signal.〔 * the driver has authority to pass that signal at danger. 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「Driver reminder appliance」の詳細全文を読む スポンサード リンク
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