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单词 position light signal
释义

Definition of position light signal in English:

position light signal

noun
Railways

  • An electric fixed signal which gives instructions to the train driver by the position of the lights on its face, rather than by the colour of the lights.

Origin

Early 20th century; earliest use found in Journal of the Franklin Institute.

Definition of position light signal in US English:

position light signal

noun
Railways

  • An electric fixed signal which gives instructions to the train driver by the position of the lights on its face, rather than by the colour of the lights.

Origin

Early 20th century; earliest use found in Journal of the Franklin Institute.
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更新时间：2025/3/10 5:31:38