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Railhub Knowledge
Distant signal
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topic ref. 77474010 | |
 .jpg "A temporary fixed distant") .jpg "Distant signals were originally red, but yellow was introduced for greater clarity") Distant signal
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(SEMAPHORE) A warning signal which gives an early indication of the state of a home signal, sited sufficiently in advance to allow adequate braking distance. The equivalent colour-light aspects are SINGLE YELLOW (= next signal is red) and DOUBLE YELLOW (= next signal is single yellow).
Distant signals were originally red, with a fishtail notch. Yellow began to be used in the 1920s for the arm and the upper aspect glass, soon becoming the standard.
A FIXED DISTANT provides a permanent caution. The arm is installed in the horizontal position and has no wire or mechanism. In recent times, a sign showing a distant arm as a graphic has sometimes been used for the same purpose.
Knowledge 7747-4010
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