headcode

名词 n.

英文释义

名词 n.
  1. A code used to distinguish classes of train for the benefit of signalmen, formerly 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. UK
    — Another appendix elucidates the S.E.C.R. headcode system.

词形变化

headcodes plural

词源

From head + code.
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