Railway signal

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Semaphore signals (Germany)

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.