SBC - Kranti Veera Sangolli Rayanna Bengaluru: Station in Garden - Dinesh Kumar

For those only who have vague concepts regarding WHEELSLIPS in Locomotives or Cars...!!
We have seen many rail-enthusiasts delivering wrong explanations regarding this without having the basic knowledge of physics
X-axis show relative speed between wheel and rail Y-axis show transmittable force
So with increasing wheel slip more traction can be transmitted, but when it is too much the transmittable force goes back...
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have to remember,
To start a body from rest to roll the force shoyld be JUST greater than the oppsing static friction. But in general in locos the power is constant and there is no on board facilty to control the traction motors (except some IGBT controlled locomotives) as per they are wanted so if the power:weight ratio is very high then the result is high spinning of the wheels which suffers to LOSS IF TRACTION and to bring the value of coefficient of the static friction the the corresponding compatible value of the angular velocity of the wheel, sanding is done...
The causes of locomotive wheels slip varies, but the predominant factor lies in the power-to-weight ratios. Ideally, locomotive designs will have a roughly equal power-to-weight ratios that enable smooth acceleration from a 'cold start', or stopping position. However, if the power of a locomotive vastly exceeds its weight, then an imbalance ensues which causes the violent turning of the wheels through loss of traction...
So We have to REMEMBER:-
Wheelslip causes Loss of Traction
NOT, Loss of traction causes wheelslip.
Its our incapability to cannot adjust the force according to the coefficient of friction