In British railway slang, 'cherries' refers to the red indicator lights or colour-coded markers used to signal a rail gap or track discontinuity. The term comes from the bright red colour resembling cherries. More broadly, rail workers use vivid fruit-based colour slang to quickly communicate track and signal conditions, keeping communications short and clear in a noisy environment.
The signalman spotted the cherries lit up on the board and called a halt before the train reached the gap.
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(rail transport, British) A rail-gap indicator.
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