Your locomotive will have the drive wheels pressed on the axle. One wheel has to slip a little going around a curve since the outside rail is longer than the inside wheel. When a locomotive goes around a curve it is trying to tip to the outside of the curve since the center of gravity is several inches above the rail. This increases the weight down on the outside wheels and reduces the weight in the inside wheels. Due to this weight shift toward the outside of the curve, all the wheel slip due to the curve occurs on the inside wheels and all of the tractive power is transmitted by the outside wheels. This results in things wearing different between the inside and outside wheels and rails. You can do a couple of things you can do to reduce the problem including turn your train around occasionally, run at lower speeds, use terack with a larger radius or build a figure eight track plan.
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