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I would have to agree with nfmisso. I had the same problem with a Peco engine. At the time I had a Tech 4 220 and an old Tyco transformer (running two tracks). The engine ran fine with the Tech 4. The pots in the Tyco went bad and the rest is history, I replaced it with another Tech 4 220 and the problem was solved. I was able to determine the pots was bad by using a volt/ohm meter.
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