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１ 问题提出沈阳铁路分局沈阳机务段地处东北铁路枢纽，现在配属东风４Ｄ型机车４３台，主要担当沈阳—大连、沈阳—哈尔滨列车的牵引任务，特别是提速和新图调整后更加繁忙，承担着全局客运量的４４％，营业里程１７１２ｋｍ，机车日行车达６４０００ｋｍ。１９９７年４月２
1 PROBLEM PROBLEM Shenyang Railway Depot Shenyang Railway Depot is located in the northeast railway hub. It is now equipped with 43 Dongfeng 4D locomotives. It mainly serves as a traction task for the Shenyang-Dalian and Shenyang-Harbin trains. In particular, it is more busy after speeding up and new map adjustment. With 44% of the global passenger traffic, business mileage of 1712km, locomotive daily mileage of 64000km. April 1997 2