他被派去扳道岔.He was assigned to man the switches.道岔无缝化是跨区间无缝线路发展的难点和关键技术.Jointless turnout is a key technique in developing CWR track across section.铁路道岔与中铁山桥平分中国市场.Railway yard with iron sanshan bridge in the Chinese market....

“道岔”的英语可以翻译为：[电] turnout ...