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在既有铁路客货混跑条件下提高列车行车速度，应遵循充分利用现有基础设施、减少废弃的原则，在一定的资金投入下获得较好的经济效益因此，必须首先确定具有决策性的若干重大技术问题，其中包括重量、密度、速度三者关系；重量密度、重量速度以及客车对数、客车速度和货车对数、货车速度的最佳匹配；客货列车提速合理的速差值确定；线路上部建筑、道叉、道口、机车车辆结构和通信信号的改造；设备配套和行车组织等
In the existing railway passenger and freight mixed conditions to improve train speed, should follow the principle of making full use of existing infrastructure and reduce waste, with a certain amount of capital investment to obtain better economic benefits Therefore, we must first determine the decision-making Of the major technical issues, including weight, density, speed of the relationship between the three; weight density, weight and speed of the bus and passenger cars, speed and logarithm of the truck, the best match the speed of goods; Determine; the upper part of the line construction, fork, crossing, locomotive and vehicle structure and communication signal transformation; equipment and driving organizations