fog signal

English

Noun

fog signal (plural fog signals)

(rail transport, UK) A small explosive charge (detonator) which can be placed on a railway line in fog, to be detonated by a train passing over it as a warning signal to the driver.
- 1960 November, L. Hyland, “The Irish Scene”, in Trains Illustrated, page 691:
  The last train—a three-coach A.E.C. unit—from Belfast to Crumlin and back, was bade farewell with fog signals as it carried a capacity crowd of last-trip travellers.

References

“fog signal”, in Lexico, Dictionary.com; Oxford University Press, 2019–present.

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