THe dirty center rail puzzles me, too. I have been using some smoke fluid lately but the #1 loop on the outside with 072 curves has only had my M-1000 on it since new. My track is new Lionel tubular with a Z and a KW transformers as power with a common ground. I have been using Red N Tacky grease on the gears and it seems to work well. Will have to keep a closer watch on it. I have no complaints on how the trains run. I can really get some slow speeds out of both stem and diesel engines. I change engines more than consists. Will look at the rollers closer, too.
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