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１ 问题的提出 沈阳机务段配属东风４Ｄ型机车４３台、东风４Ｂ型机车３２台，合计台数达到７５台，占段配属机车总数（１３６台）的５５％，主要担当沈阳至大连、长春、哈尔滨等主要干线客运列车牵引任务。经过两次机车提速后，最高时速由过去的１１３ｋｍ／ｈ，提高到现
1 PROBLEM PROTOCOL The Shenyang locomotive depot belongs to 43 Dongfeng 4D locomotives and 32 Dongfeng 4B locomotives, with a total of 75 units, accounting for 55% of the total number of locomotives (136 units), mainly serving Shenyang to Dalian, Changchun and Harbin Such as the main trunk passenger train traction mission. After two locomotives speed up, the maximum speed from the past 113km / h, increased to the present