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  1. Overview

    In railway signalling, an interlocking is an arrangement of signal apparatus that prevents conflicting movements through an arrangement of tracks such as junctions or crossings. In North America, a set of signalling a… See more

    Configuration and use

    A minimal interlocking consists of signals, but usually includes additional appliances such as points and Facing Point locks (US: switches) and derails, and may include crossings at grade and movable bridges. Some of th… See more

    History

    Railway interlocking is of British origin, where numerous patents were granted. In June 1856, John Saxby received the first patent for interlocking switches and signals. In 1868, Saxby (of Saxby & Farmer) was awarded a … See more

    Interlocking types

    Interlockings can be categorized as mechanical, electrical (electro-mechanical or relay-based), or electronic/computer-based.
    In mechanical interlocking plants, a locking bed is cons… See more

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