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True, but if the wheels are virtually any metal or alloy, it's really only the oxide (or other contaminants) on the contact surfaces you have to worry about. Oxidation on the surface of any metal will dramatically increase the conductivity of any contact running through that surface. Such oxidation is increased and speeded up through chemical contaminants on that surface and/or by electrical arcing caused by poor contact, so a periodic and thorough track cleaning is one of the most-prescribed 'first aid' measures suggested to avoid (or cure) performance issues.Ya Mike. First, great point about the wheels being capable of creating that resistence. I would think literally anything applied made of atoms contributes to resistance.