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Ok. So the wheel 'falls' towards the centre and the whole rig seeks the low point. Also if the axle were off center, the high riding wheel would be rotating at with a larger diameter, hence speeding up that side relative to the low riding opposite wheel, thus turning the axle and the high riding wheel runs down the rail towards the inside. Cute.
You still need the bank so the train does not tip over to the outside of the curve. Plus given sufficient speed, the self-centering force could lose the battle against the centrifugal force. Self-centering or no, the wheels could slide right off the rails.
Bill
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