danger signal

English

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Noun

danger signal (plural danger signals)

  1. (rail transport) A signal set at danger and showing a red light or other stop indication, which a train driver must not pass until it changes or until manually cleared past the signal by a dispatcher.
    • 2005, "Practical Railway Engineering" by Clifford F. Bonnett, Imperial College Press →ISBN [1]
      On a train travelling at say 40 miles per hour a driver would have to react quite quickly to bring his train to a halt at a danger signal even if he could see that signal half a mile away.
  2. (also figurative) An indication that a potentially bad or dangerous situation could develop.

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