| 释义 |
> as lemmasline clear In 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).< |