Cool! I'll say! 
I picked up my new Z4000 yesterday from our local hardware store that still sells a lot of trains. That in McCormick's Hardware in Zelienople, Pennsylvania. It is about a half hour away, and near my aunt's senior living facility, so I picked it up instead of paying who knows how much to ship. 
I have wanted one for some time, but always said later. Last Sunday, I setup an oval of O54 track on the Patio Pacific to run my new-to-me Premier PS3 N&W J 611. I took my ZW, TIU, Z500 for aux power, my breakers and diodes as I have read to protect the MTH electronics outside and hooked it all up. Everything was fine, as I ran the J very slowly. The first curve it lifted a driver off the rail, which I attributed to a slight unevenness to the concrete the Ross track was on. I stopped and put everything back on track. The next curve was level and smooth, and the driver came off the track slightly. Then I saw a spark, and shut everything down. 
When I checked, my breakers hadn't tripped as happened once on my O48 indoors with a freight car. I put everything away, got on Jeff McCormick's Web site, and ordered the Z4000 and the next larger curve track that evening.
I was concerned I could have fried something in the J or the TIU, but after setting everything back up using the Z4000, everything tested out great! 
I'll keep the ZW for now and if I find I don't use it on the new layout, I'll find another home for it. 
