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I have a 1930s Lionel Union Pacific M-10000 train. It was repaired a year ago and ran perfectly. I recently set it up, adding grease to the wheels and gears. It was running excellently, but now it is slowing to a crawl, and often stops totally. The first time this occurred, it seemed to be a stuck wheel. But not now. It runs fastest nearest the power source. So far as I can see, the only possible problem is greasy wheels and track--but I assumed that was normal. The engine seems to run with no problems, and in fact goes around rapidly when it is running by itself. It will also run with just one car attached. It runs when any one car is attached, and the vestibules are interchanged, reversed, etc. Can anyone suggest what might be going wrong?
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