Railway semaphore signal
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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 inclinati
Upper quadrant semaphore signals at Castleton East Junction in England
German semaphore distant (left) and home (right) signal exhibition in Steinfurt, Germany
Upper-quadrant signal on the Santa Fe Railroad, 1943. The vertical position indicates a "clear" aspect.
Lower-quadrant stop signals at St. Erth in 2007
Signal passed at danger
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A signal passed at danger is an event on a railway where a train passes a stop signal without authority. This is also known as running a red, in the United States as a stop signal overrun and in Canad
Railway semaphore signal
…still present on the national network's secondary routes, though increased spending on renewals has led to a faster rate of decline in recent years. Signal passed at danger Rule 55…
Two-aspect signal at danger (stop) in the United Kingdom
SPAD indicator