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There may, however, be some more fine points to the explanation that others might be able to supply.  I recall reading that diesel locomotive wheel treads have either less taper than rail cars, or have no taper.  I am not sure about steam locomotives.  If this is true, I would like to know why these powered wheels lack taper.  To my eye, the blind drivers on steam locomotives that have them appear to lack taper on the tread.
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