We just got a Lionel Lionmaster J3A Hudson 4-6-4, produced in 2003 but in factory condition. It looks and runs great, except for one thing: as it's moving, especially at higher speeds, the engine body rocks up and down on the sides, sort of a wobbling motion. The distance it wobbles isn't that much, maybe 3/8".
Is this normal? The engine is noticably narrower than other Lionel engines we've had, does this have anything to do with it? Could the engine mount or drive assembly be misaligned?