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Walt i am glad you have waded into this, i know a bit about your technical backgrownd and it will help i think.Consider a piece of track, it has 4 ends, three of which are islolated, so in fact i have two pieces of track. the blue wire is connected to the first section and also bewteen the two pieces of track. The near section had 2 V between the rails and the far section had 1.5 between the rails. today the 2V has gone up to 6V.I can supply a circuit diagram and a photo if it will help.If i disconnect the AC from a wire that is running alongside, it reduces by about 0.5 V. If i disconnect the MTS it goes away all together. I think Kevin hit the nail on the head, i think it is the ballast which is providing a core if you like and the whole thing has become a weird  big transformer. I sold transformers for a living for 18 years.What do you think Walt, i will be glad to see it. Have a good read about what Kevin and I have said.Rgds ian
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