I upgraded to a KW transformer recently to provide enough power to run two older locomotives (736 and 2034) on separate tracks, as well as power a bunch of accessories on fixed voltage. Everything is working fine except a section of insulated track, to which are connected a gateman, crossing gate, crossing signal, and whistling freight shed. The insulated track section is located just past an O-22 switch and is separated from the switch by a short section of non-insulated track. When the locomotive enters the section, there are sparks around the wheels and it slows down slightly. If cars are attached, all of them spark at the wheels. When the train passes through the insulated track section, the sparks stop. All of the attached accessories mentioned above work fine when triggered by the train. There is a lock-on in the insulated section with all of the connections at the #2 post; nothing on post #1. There is a track power lock-on just outside the insulated track section on the non-insulated track. I have cleaned the track on the insulated section, as well as all the wheels on the locomotive and cars, and checked for loose screws or stray metal on the track (which is screwed down over top a cork base). When testing the insulated section with the locomotive removed, using a lighted caboose, the issues start as soon as I roll the caboose into the insulated track section, and end as soon as the caboose is removed from the section. Seems like everything is hooked up right, but something's not right. I'm at a loss and open to any suggestions. Thanks much.