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It seems to me that I recall hearing about a design that had both wheels running with bearings on a fixed, non-rotating axle.  So both wheels were free to turn independently from each other.  I don't know why they departed from conventional practice.  I think it was on high speed or light weight passenger trains.  With that arrangement, the wheels would not self center. Incidentally, I have also heard that locomotive wheels are not tapered.
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