Railway signal 铁路信号机

（重定向自Position light）

Semaphore (German)Colour light (British)Two common types of signal. In both cases, the left signal shows

The additional lights on signal 10 show that the points are set for the left route at the next junction.

Some signals can convey large amounts of information. These signals show that the train should advance, that the speed limit is reduced from 60 km/h to 30 km/h, and that it is approaching the end of the line.

A signal is a mechanical or electrical device erected beside a railway line to pass information relating to the state of the line ahead to train/engine drivers (engineers in the US). The driver interprets the signal's indication and acts accordingly. Typically, a signal might inform the driver of the speed at which the train may safely proceed or it may instruct the driver to stop.

单词	Position light
释义	Position light 原声例句科普小杂文 Morgan's version had three light positions instead of just two. 摩根的设计由两个灯变成了三个灯。英语百科 Railway signal 铁路信号机（重定向自Position light） A signal is a mechanical or electrical device erected beside a railway line to pass information relating to the state of the line ahead to train/engine drivers (engineers in the US). The driver interprets the signal's indication and acts accordingly. Typically, a signal might inform the driver of the speed at which the train may safely proceed or it may instruct the driver to stop.
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