Railway Wheel Coefficient of Friction
The weight of the train and the amount of the axle can determine the rolling friction coefficient, so it can determine that the motor must overcome the resistance torque to keep the train from driving.
When it comes to braking or acceleration, the situation is different. The maximum possible torque is that it does not cause the torque to slide, that is, the required force is lower than the torque that can be calculated by the steel static friction coefficient.
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