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.functional requirements at rgsonline.co.uk It was introduced in the design and operation of United Kingdom passenger trains in the 1990soriginal 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
