高速铁路列车速度快、行车密度大，要求牵引功率高，电力牵引成为高速铁路动力牵引的必然选择。
For the rapidity and traffic density of trains on high-speed railway, larger traction power is needed, so the electric power supply is adopted.
近年来铁路提速和重载运输的大力发展、客货运量和行车密度大幅度增长，导致钢轨磨耗日益严重。
Recent years, with the rapid development of railway transportation, and the grate increase in the capacity of trains for passengers and goods, the rail abrasion becomes a serious problem.
本文根据四大干线的技术条件，论证了提速客货列车的牵引质量，运行速度，行车密度间的合理匹配。
Based on the technical conditions of the four major trunk lines, this article demonstrates the rational match between hauled weight, operating speed and traffic density.
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