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For what it's worth, be wary if you have to change a brush plate.  Locos with the brush plate on the right side of the loco use a plate that differs from those with the plate on the left side.  I found this out about 40 years ago when I delved into why my 224 went faster in one direction than the other.  Seems that when I was small, the plate had broken and my father had it repaired by an "expert."

 

I agree that repairing should be easier & cheaper.  Unless you want it original, think about installing an electronic reverse unit.  You'll get rid of the hum.

If you're sure the e-unit is making contact, I would remove the brush plate and make sure than the brushes are not worn so far that they don't reach the commutator, that they're not stuck in the brush holders, and that the springs still have enough strength to hold the brush in contact with the commutator.  Also, while the plate is off, make sure that there are no metal filings between the 3 segments of the commutator.

 

Are the track rollers clean and making good contact with the center rail?  The springs sometimes get weak.

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