Railway signalling
Railway signalling (British English), or railroad signaling (American English), is a system used to control the movement of railway traffic. Trains move on fixed rails, making them uniquely susceptible to collision.
Railway signalling (British English), or railroad signaling (American English), is a system used to control the movement of railway traffic. Trains move on fixed rails, making them uniquely susceptible to collision.
Railway signalling (British English), or railroad signaling (American English), is a system used to control the movement of railway traffic. Trains move on fixed rails, making them uniquely susceptible to collision.
Source: Wikipedia "Railway signalling" · CC BY-SA 4.0
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