| 单词 | position light signal |
| 释义 | > as lemmasposition light signal position light signal n. 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 (cf. colour light signal n. at colour n.1 Compounds 4). ΚΠ 1914 Jrnl. Franklin Inst. May 569 The development of the position light signal has not yet reached the stage where any further comment is warranted. 1924 N.Y. Times 5 Feb. 34/2 The existing signaling will be changed over to alternating current track circuits and position light signals. 2005 S. Hall Mod. Signalling Handbk. (rev. ed.) 15/1 Train movements other than normal direction running movements are known as shunting movements and are controlled by position light signals. < as lemmas |
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