English Dictionary

one engine in steam

phrase

(rail transport, UK) 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.

There is only one engine in steam.

意味（1）

(rail transport, UK) 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.

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.