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In this Video you see how LHB Coach/trolley WSP System Work.
WHEEL SLIDE PROTECTION DEVICE help in Braking.
WSP system has been deviced to eliminate flat tyre defect from the wheels of a rail bogie. It uses the available adhesive force between a wheel and railtrack for the purpose . Added by a CPU , speed sensors ,dump valves , it regulates the motion of all wheels in such a way that during brake application the wheel which is going to skid, dumps it braking pressure and the RPM of all wheels are regulated.