Railway semaphore signal
Form of fixed railway signal / From Wikipedia, the free encyclopedia
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"Semaphore signal" redirects here. For other signals sent using semaphore, see Semaphore.
Railway semaphore signal is one of the earliest forms of fixed railway signals. This semaphore system involves signals that display their different indications to train drivers by changing the angle of inclination of a pivoted 'arm'. Semaphore signals were patented in the early 1840s by Joseph James Stevens, and soon became the most widely used form of mechanical signal. Designs have altered over the intervening years, and colour light signals have replaced semaphore signals in most countries, but in a few they remain in use.
The examples and perspective in this article may not represent a worldwide view of the subject. (February 2018) |