Steve,
Thanks for the response. I have not added anything to the tracks or power lines. Also, do not have an ability to test capacitance. I can test AC, DC DCC, and resistance. As in my Air Force electronic days (1969-1979) when I worked on tubes, real capacitors, and real resisters with colored lines on them, I think I need to go back to: "what was the last thing I did to any tracks." That being - I have been working on a highway crossing across/overlapping two 0-31 curve sections. I was working on wood plus neoprene cut out layers to fit inside the rails. Had not gotten to outside road leveling up to the rails. My only thought is to start there and then pull every section of track and test them. Can't afford to eat up anymore TIUs with or without WIU. PS: I left the electronics repair world while transistors were exciting and integrated circuitry was two layers of a board. I had to teach myself all my layout wiring and using a multimeter again when I started playing with my train in 2017. Note: I do have some glued-on mini-rock walking paths and some ground foliage up close to the outer rails, but the trains all worked fine with those and all my other walking path/road crossing for months.
