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The DRA is the bright red button at top left of the driver's desk The Driver's Reminder Appliance (DRA) was introduced in the design and operation of United Kingdom passenger trains in the 1990s[1] in response to a series of railway accidents where a train driver had started away from a station stop against a red signal.[2] It is simply a manual switch that prevents power from being applied when it is turned on.[3] Contents 1 Operation 2 Advantages 3 Problems 4 References 5 External links Operation Use of the DRA is mandatory[4] for drivers of British passsenger 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.[5] the driver has authority to pass that signal at danger. Advantages A passenger train driver can easily become distracted by station duties and forget that the next signal is at danger. This signal might be hidden from view until the train is close to it and there is insufficient braking distance. The DRA helps prevent this problem because resetting the DRA is the last action the driver will take before powering away from the station. Problems The original DRA button was make out of plastic and broke after a while, which put the train out of service and caused delays. A manufacturer came up with a metal button which had a longer life. [6] References ^ http://www.rgsonline.co.uk/docushare/dsweb/Get/Rail-42673/rt0091_1.pdf original requirements for DRA ^ http://www.hse.gov.uk/research/crr_pdf/2001/crr01334.pdf accident investigations including evaluation of DRA ^ http://rgsonline.co.uk/docushare/dsweb/Get/Rail-41176/RT2491.pdf functional requirements ^ http://rgsonline.co.uk/docushare/dsweb/Get/Rail-43796/GERT8000-TW1+Iss+8.pdf operational requirements (section 10.3) ^ http://rgsonline.co.uk/docushare/dsweb/Get/Rail-43796/GERT8000-TW1+Iss+8.pdf operational requirements (section 10.3) ^ http://www.pkaye.co.uk/docs/drabutton.doc External links Railway Group Standards - 1997 Halcrow report on SPADs and DRAs This United Kingdom railway-related article is a stub. You can help Wikipedia by expanding it.v · d · e