Wheel Rolling
The wheel rotating on its axle theoretically without motion existing between the wheel and the rail at the area of contact.
Wheel Set ...
A three inch flat spot on a wheel rolling at 50 MPH is equivalent to several hundred thousand pounds of pressure hammering the rail. This hammering can cause internal failures in the rail which lead to breaks.
 See also: Point, Passenger car, Train, Subdivision, Section
  
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