I've been setting up my first Fastrack carpet Christmas tree layout having tossed a 20 year old set of RealTrax. The Fastrack is proving more difficult, but in fairness it's a little more involved than the RealTrax loop with had no switches.
You can see in the track plan below that I have a 1 3/8" section (the ones with the jumpers on the bottom and the split middle rail). I circled the 1 3/8" piece. I'm having problems with the rest of that dead end siding having very iffy electrical connection with that 1 3/8" section in there. If I take it out there problem goes away. I've tried two different 1 3/8" pieces. Both do the same thing. This is baffling.