Driver's reminder appliance
UK railway safety system / From Wikipedia, the free encyclopedia
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A 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 apply power.[1] It was introduced in the design and operation of United Kingdom passenger trains in the 1990s[2] in response to a series of railway accidents where train drivers had passed a signal at danger when starting away from a station.[3]