Simulation and line test on typical mountain railway of Xiang-Yu Line were conducted to study the feasibility and concerning problems for the operation of HXd1 (9 600 kW 8-axle locomotive) on line with long steep grades, based on which, reasonable tonnage of traction for this type of locomotive was provided for hauling freight train on typical mountain railway in western China. Study results show that the tonnage of traction for this type of locomotive should be no more than 4 500 t for line with 12. 8‰ gradient. Under fine weather condition, the adhesion utilization of the locomotive is good, operations such as starting on slopes, stopping and starting at stations with difficult conditions can be successfully completed. But the traction force is applied to the utmost and slight slips are found. Operations including starting on slopes and operating in stations with difficult conditions are suggested to be avoided under unfavorable adhesion conditions, such as, light rain, dense fog and so on. Compared with DC driven locomotives, when hauling freight train of same weight, AC driven locomotives can save 33. 6% energy. Moreover, the restoration of locomotive after neutral section is proved to be slow, which does not satisfy the requirement of quick restoration for operation on line with long steep grades. It is suggested to optimize the control logic of locomotive's neutral section passing.%选取典型山区铁路襄渝线,采用仿真计算和线路试验相结合的方法,研究HXD1型8轴9 600 kW电力机车在山区铁路长大坡道地段应用的可能性及存在的问题,确定该型机车牵引货物列车在西部典型线路上运行时合理的牵引定数.结果表明:在坡度为12.8‰的坡道上,该型机车的牵引定数不宜超过4 500 t；在天气良好的情况下,该型机车的黏着利用较好,能够在限制坡道起动,在困难车站完成出站等作业,但牵引力已经用到最大,并出现了轻微空转；建议在小雨、大雾等黏着不利条件下应尽量避免在困难车站作业以及长大坡道地段起动；同等试验条件下,交流传动机车可比直流传动机车省电33.6％；试验中发现该型机车过分相牵引恢复时间较长,与长大坡道地段对牵引力快速恢复的要求不相适应,建议对机车过分相控制逻辑进行优化.
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