one engine in steam

English

Phrase

one engine in steam

  1. (rail transport, Britain) A principle in railway signalling where only one train or locomotive is allowed to run on a section of single-track line, such as a branch line, at any one time.
    • 1960 March, “Talking of Trains: S.R. branch report”, in Trains Illustrated, page 135:
      A change seems likely on the Axminster-Lyme Regis branch [...]. We hear also that one-engine-in-steam operation will probably be introduced on this line.
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