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micheal answered the what, now I'll handle the "why". Because Athearns come with sintered iron wheels, they pick up crud more easily than the smoother nickel-silver wheels. As with most things, there is a trade-off. The nickel-silver wheels may stay cleaner, but they also don't stick to the track as well. Anecdotal evidence from rec.models.railroad suggest that your locos may lose 10-20% of their pulling capacity. If you're picking up crud that quickly, it sounds like the track may need to be cleaned. Not because of oxidation, but because of dust and oil.
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