track maintenance and repair 线路养护维修
Make the repair the parts which disassembled from the machines , in order to track, make the record about exchange and maintenance.
安排维修生产线换下来的各类零部件，及各类配件的更换记录和维修记录，便于及时跟踪。
The author suggests a new system to do track maintenance and repair work separately on Datong-Qinhuangdao Railway Line.
建议大秦铁路线路养护维修工作试行养修分离新体制。
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