I decided to test some of my other PS-1 Shelf Queens. They all showed the same problem. The test track I was using had both TMCC and DCS. I built a test track with just a simple traditional transformer. On the new test track 6 of 7 PS-1 engines worked properly including the original engine. The 7th engine still exhibits the 2 clank problem. When I want to run or sell that engine I will either upgrade or exchange the PS-1 electronics.
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