I forgot to mention: small pits can be sanded out, but don't forget, you are making the top of the track thinner! Sanded track shouldn't have any sharp edges at the pits (because of the sanding), but it does encourage electrical arcing, which CAN lead to reverse unit cycling and early wear-through of the rail top. As to damaging plastic wheels, I am more concerned with sharp edges at the ends of the track pieces. After assembling your track, I would recommend checking the joints for sharp "burrs" or edges, and file or sand them down. S' David D.
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