also a lot of times the brushes wear on a angle and might create an issue when changing directions. also helps to polish the commutator with emery paper very fine grit and clean out the gap between the segments. and then take a tooth pick and clean out the gap it builds up with carbon threw time especially the old post war engines Lionel. also some times u need to replace the springs n brushes. if the brushes look like there long enough but are worn on an angle you can use emery paper until there straight again . springs can loose there tension which can cause your issue as well!
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