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释义
society > travel > rail travel > railway system or organization > [adjective] > types of signalling (2)
block signalling1864

A blocking up. block system n. on Railways a system by which the line is divided into short sections, having at the end of each a signal, and a…

multiple-aspect1932

designating a colour-light railway signal capable of displaying at least three aspects.

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更新时间:2024/12/24 21:22:23