a section of double railroad tracks formed by the temporary convergence of two parallel tracks in such a way that each set remains independent while traversing the same ground,affording passage at a narrow place without need of switching是什么意思_a section of double railroad tracks formed by the temporary convergence of two parallel tracks in such a way that each set remains independent while traversing the same ground,affording passage at a narrow place without need of switching在线翻译_英语_读音_用法_例句