The wheel flange wear is caused by the flange action of the wheel and rail, whereas the double-groovewear on tread may be mainly caused by the break shoe.
轮缘磨耗主要是轮轨相互作用的结果，而踏面上的凹槽磨耗可能主要由闸瓦制动引起。
2
Pump is the drainage and back into the groove of reasonable design, is a gear in the work under the minimum torque force, so the bearing load is small, wear small, pump with high efficiency.