They have low friction and can be produced with high precision and in quiet running variants.
它们摩擦力低，可以制造出精确度高，满足安静运行要求的各种类型。
Experimental results show the change of friction factor is correlative with the difference of running temperature and installation temperature but not the force time.
经过数据整理得出了以下结论：摩擦系数的大小变化决定于运行温度和安装温度差，和“推动次数”无关。
The influence of train running speed, wheel-rail friction coefficient, vehicle load, track geometric irregularity, partly load, gauge and the shape of wheel tread on derailment was emphasized.
论文重点分析了车辆运行速度、轮轨摩擦系数、车辆载重、轨道几何不平顺、偏载、轨距大小、车轮踏面形状等因素对脱轨的影响。
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