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or slow trains in advance of a restrictive situation. The cab signal system is an improvement over the wayside signal system, where visual signals beside or above the right-of-way govern the movement of trains, as it provides the train operator with a continuous reminder of the last wayside signal or a continuous indication of the state of the track ahead.

History

The first such systems were installed on an experimental basis in the 1910s in the United Kingdom, in the 1920s in the United

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