Engraving of a railway signal box

Engraving of a railway signal box

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Credit: SCIENCE PHOTO LIBRARY

Caption: Signal box. Engraving of a section through a railway signal box in the mid-19th century. Railways at this time used a semaphore system, where the position of pole-mounted signals was used to pass information to train drivers. These signals were moved by wires which led to the signal box. The signalman pulled on these wires using 1.2-metre long levers.

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Keywords: artwork, engraving, historical, history of science, land, lever, railway, railway signal box, signal box, technology, transport, transportation

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