I have a Lionel postwar Berkshire that was running well until last week when it refused to go forward or backward. I took it into a repair shop. Apparently, the shop cleaned some parts but did not have to replace any to make the engine run again. I brought it back home and it ran very well for two days. All of a sudden when I tried to start it up again today, it failed to work again. Just out of curiosity, is there anything in the voltage from the transformer or track system (ie. shorts) that could cause a malfunction in the E-unit?
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