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[quote user="Paul_D_North_Jr"]  In most instances the result is that the wheels are bearing against the outer rail, but by no means always.  When they're bearing too hard against the inner rail, they can climb over it, or the car can tip over, a phenomenon often called "string-lining". - Paul North. [/quote] Paul, That is my understanding as well.  That is that there is indeed stringlining that pulls the cars in a cut up against the inside rail or the curve at low speeds with hard pulling.  And when that happens, the differential effect of the wheel tapers is exactly backwards.  So it causes the wheel rotation to be out of synch with their travel speed on one side or the other.  Generally it appears to be the inner wheels that run out of synch on such curves because the inner rail is often heavily burred.
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