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Could be dirty commutator. It will go slow until any oil or gunk is burned off. Give the segments a clean and wipe in the gaps between the segments with a toothpick. I had that problem with an Athearn SD40.
Robert
Very light oil or graphite electric points, or clean the wheels and track.
any one might be the problem.
Could be dirty commutator. It will go slow until any oil or gunk is burned off. Give the segments a clean and wipe in the gaps between the segments with a toothpick. I had that problem with an Athearn SD40.
Robert