Railway semaphore signal
Railway semaphore signals are an early form of fixed railway signals. The semaphore system involves signals that display their different indications to train drivers by changing the angle of inclination of a pivoted 'arm'.
Railway semaphore signals are an early form of fixed railway signals. The semaphore system involves signals that display their different indications to train drivers by changing the angle of inclination of a pivoted 'arm'.
Railway semaphore signals are an early form of fixed railway signals. The semaphore system involves signals that display their different indications to train drivers by changing the angle of inclination of a pivoted 'arm'.
Source: Wikipedia "Railway semaphore signal" · CC BY-SA 4.0
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