track tread 履带
The depth of the tread makes the I-Beam well suited to loose and medium-packed conditions with deep areas of loose dirt around the edges of the track.
深度使胎面的I -梁适合松散和中型包装条件，深领域的松散的泥土的边缘附近的轨道。
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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