Railway semaphore signal facts for kids
One of the earliest forms of fixed railway signal is the semaphore. These signals display their different indications to train drivers by changing the angle of inclination of a pivoted 'arm'.
Images for kids
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Lower quadrant stop signals at St. Erth in 2007
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Signals on the River Weaver Navigation, directing boats into the paired locks
See also
In Spanish: Semáforo ferroviario para niños
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Railway semaphore signal Facts for Kids. Kiddle Encyclopedia.