运杂费分析中经济运距分界点的确定

首先介绍两种被铁路工程广泛应用于经济运距分界点确定的最大距离相等法和平均运距相等法，并对这两种方法的直观性和正确性提出疑问。为合理确定经济运距分界点，在假定条件一致的情况下，从理论上提出用微积分的方法来解决此问题。然后将微积分法与最大距离相等法和平均运距相等法进行对比分析，得出原来使用的两种方法的前提和结论之间没有直观的因果关系，而平均运距相等法在理论上就是错误的结论。

Determination of economic haul separation point in analysis of freight and miscellaneous charges

This article first introduces the two methods of maximum haul equation and mean haul equation determined by the economic haul separation point extensively used in railway engineering with doubts raised about the visualization and correctness of the aforesaid two methods. In order to reasonably determine the economic haul separation point, under the identical given conditions, the calculus method is theoretically proposed to solve this problem. A comparative analysis is then made between the calculus method, maximum haul equation method and mean haul equation method. In case the precondition and conclusion of the originally used two methods are found not to have the direct vision causal relationship, the mean haul equation method is wrong in theory.