headcode

English
A four-lamp headcode was only used on royal trains.

Etymology

From head +‎ code

Noun

headcode (plural headcodes)

  1. (rail transport, Britain, obsolete) A code used to distinguish classes of train for the benefit of signalmen, by using white oil lamps (or white discs) placed on brackets on the front of the locomotive. The various lamp positions defined the class of train.

Further reading
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