Just remembered another question i have---i have a temperary set up in the workroom so i can run trains while layout is built. an oval of 22" radius with an oval of 18" radius inside. i want to run two trains at the same time. can this be done with one transformer or will the inside track require a transformer of it's own? Another thing, for some reason, my IHC 4-6-4 will jerk and slow down at the same spot in the 2 straight track section along the wall, runs normally around the rest of the circuit. The tract sections are tight and track is clean in this area. Could i have a section that is a little narrow? My 2-10-2 and the Decopod, 2-10-0, do not seem to have the same problem. Any ideas or suggestions? Thanks for your help-----John R