If I swap, the problem reverses itself. The loop is simple with each end taking off of a different Peco turnout (see first picture). The insulated rail joiners at the top of the picture are immediately after the turnout. After learning that the gaps should be 1/8? staggered, I moved the gaps at the bottome part over the bridge and just cut a couple gaps in the rail about 4" from the turnout. Further thoughts I could not get to earlier - You had said to change CV53 to a 1. That was a value I had not changed before but it still seemed to make no difference regarding the lcomotive operation. As far as that goes, I can not even tell if any of the values I am changing are actually changing. For all I know, I'm changing all kinds of values on my keypad with nothing actually happening. Does the bogus locomotive address need to be within a certain range? I've tried addresses ranging from 100 to 1010. Is my wiring having an impact on this? I'm using a 16 gauge speaker wire running approximately 9' from my Zephyr past all of my other rail feeds to eventually terminate at the end of the layout underneath the reverse loop. Do I need to run a seperate wire from the Zephyr to the reverse module? I had the reverse module screwed to the bottom of the layout but after laying upside down for a while, I got tired of it and placed it on top of that PB jar and started using alligator clips instead of screwing and unscrewing the wire clamps every time. Maybe with the pictures, you'll see something wrong.