I did some train running today, with my shorty Rugged Rails F3 (3 volt PS2 package) on my upper loop. At one point, I lost control of it, total control. Couldn't stop, blow the horn, etc. Just got check track. I cleaned the track, and ran another engine up there and all was well. Put the F3 back, no luck. Just get check tracks.
While I was running trains, I was changing a few address numbers on engines (the F3 included) that were running. The layout is powered CURRENTLY by 1 Z1K powering the upper and lower loops, 3 trains in total. My other Z1K, which handles just the upper loop, is powering the Christmas tree layout for a few weeks. I usually have two Z1Ks running.
Any and all tips are much appreciated.