特定线路上的运输量越大，客运密度、货运密度越高，平均运输成本就越低。
The larger the traffic volume on the specific circuit is, the higher the density of passenger traffic, freight transportation, the lower the average transportation cost is.
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.
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