one engine in steam

短语

英文释义

短语
  1. 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. UK
    — There are eight 4-wheel coaches of the open toastrack type, but provided with roofs, and during the holiday season, usually beginning at Whitsuntide, trains are run as required on the one-engine-in-steam principle.
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