British Railway Signals
Modern British signalling is based on a two, three, and four aspect colour light system using non-permissive block rules. It is a basic progression of the original semaphore signalling that can still be found on many secondary lines. The use of lineside signals in Britain is restricted to railways with a maximum permissible speed of up to 125 mph (201 km/h).
Read more about British Railway Signals: Junction Signals, Banner Repeater Signals, Miscellaneous Indicators, Speed Restriction Signs
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—Edmund H. North, British screenwriter, and Lewis Gilbert. Captain Shepard (Kenneth More)
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