近年来,干线内燃机车的故障率有所上升,这是货运量繁重区段的通过能力所以损失的其中一个原因。内燃机车计划外和计划内技术保养和修理的在修停留时间延长后,使正常运行之内燃机车的数量就减少,因而给编组站的列车牵出工作经常造成困难。由于内燃机车 In recent years, the failure rate of mainline diesel locomotives has risen, which is one of the reasons for the loss of capacity through heavy capacity. After the unplanned and scheduled maintenance and repairs of diesel locomotives, the number of diesel locomotives in normal operation has been reduced after the extended stay of repairs, and as a result, the train pull-out work to the marshalling yard has often caused difficulties. Because of diesel locomotives