(rail) A device in the cab of a locomotive or train which displays the status of signals along the track.
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As we sped effortlessly along at a steady 75-80 m.p.h., with the three vertical lights of a clear aspect shining unwinkingly on the ground glass of the cab signal, our engineer lolled back in his chair and leisurely lit a huge cigar; [...].
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1961 June, J. Geoffrey Todd, “Impressions of railroading in the United States”, in Trains Illustrated, page 357: