| 单词 | loop line | 
| 释义 | > as lemmasloop lineIn railway language variously applied 		 (a) to a single track of rails, as in  the up line,  the down line;		 (b) to a railway forming one of the parts of a system, as in  main line,  branch line,  loop line;		 (c) sometimes to an entire system of railways under one management, as in  the Midland line.  line clear, a signal indicating that a line is unoccupied and that a train may therefore proceed;  line of rail (see quot. 1965; cf. end of steel n. at end n. 6f).extracted from linen.2 < as lemmas | 
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