列车牵引计算规程要求计算列车牵引质量时，计算和检算牵引质量的线路纵坡要求不得简化。论文从列车牵引质量计算和检算要求出发，根据线路纵断面的实例，分析了较短限坡下的列车受力问题，给出了列车跨越不同坡段时附加阻力的计算方法。根据这一方法，对比计算了不同方法中列车牵引质量的计算差异，最后给出列车牵引质量计算时有条件化简线路纵断面的建议。%No simplification of railway longitudinal section when calculating train traction capicity is required by Chinese Train Traction Calculation Standard. By an example, the forces acting on a train running on a short and steep rampway were discussed, and a method calculating the additional resistance when a train running on a railway with multiple slopes was set up. Some other methods were compared to show the differences among the new method and the old ones coming from the standards. At last, some suggestions were given for improving the railway longitudinal section simplification.
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