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Ran the engine for a while backwards , the next day I turned the engine around where front is in the front , and its not coming off the track anymore , not sure what was happening , but it seems fine now , 

New Union Pacific Sherman Hill Scout train set , engine comes off track (front wheels) where curve goes into straight track , tried turning train around , only thing that works is turning the engine around , and running it backwards , the center rollers under the front drive wheels seem very stiff , any input on this problem would be a big help