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…
单词 | θ202628 |
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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