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I have an MTH 20-20222-2 U25B Diesel Engine With Proto-Sound 3.0 (Scale Wheels) and the rear truck is "missing" when I try to drive it.  The front is okay.  I looks like there could be either a gear slipping or a gear with broken teeth.  I would like to look into it before sending off for repair but would prefer to see a diagram first.  Anyone know such?

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