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单词 train signal
释义

train signal

noun
1A light, semaphore, or other device used to signal instructions or warnings to or from a train; compare signal.
2A method of communication between the carriages of a train and the locomotive using a continuous pipe (now historical ).

Origin

Mid 19th century; earliest use found in Rules & Regulations for Engine-drivers & Firemen.

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更新时间:2024/11/12 8:03:59