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Whilst a Guard at Huddersfield, we had oil tail lamp on the rear of DMU's. This was changed in 1982 to two electric lights built into the the DMU. These were operated from switches in the cab of the unit.
The tail light is on the train to inform the signalman/others that the train is complete.
The definition of a trian is;
' A collection of vehicles, complete with a tail lamp. '
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