...Another good reason NOT to build locos with the motor leaning forward into the boiler!
Not sure what you mean by 'wobble.' You might post a video to show us what you mean. But I would suspect the rubber tires (another pet peeve of mine), or maybe a crooked wheel or axle. One GOOD thing about these locos, is that they have a "bottom plate." So assuming the parts are in stock, you could order two new wheels and axles from the Lionel parts dept. to replace the existing ones. Hopefully that will smooth it out.
