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[quote user="Ulrich"] As a locomotive rounds a curve the wheels on the outside of the curve turn faster than the wheels on the inside of the curve. So do the push rods that power the outside wheels also move  faster than the pushrods on the inside of the curve, or is there some mechanism to compensate (similar to a differential in an automobile)? <div style="clear:both;"></div> [/quote] The compensation is in the cone shaped of the wheel treads shifting to a larger diameter on the outside rail and a smaller diameter on the inside rail as the wheelset naturally moves to the outside when rounding a curve.  The wheels are pressed onto the axles the same as on rolling stock, so there can be no differing of rotation speed between one wheel and it opposite wheel.
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