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Railway signal

German semaphore signals
Semaphore signals (Germany)
British colour-light signals
Colour-light signals
(Great Britain)
Two common types of signal. In both cases, the left signal shows "danger".

A railway signal is a visual display device that conveys instructions or provides warning of instructions regarding the driver's authority to proceed.[1] 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.

  1. ^ Subset-023. 'ERTMS/ETCS-Glossary of Terms and Abbreviations'. European Union Agency for Railways. 2014.

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