I'm in the DMZ between 3-rail and 2-rail. I run scale-wheeled equipment at my hi-rail club using MTH engines set to 3-rail mode under DCS. However, I also ran a demonstrator on a 2-rail layout at a train show a few years ago under NCE DCC. It went into the system right away without incident and ran flawlessly for hours. When I build my home layout, I still don't know if I'm buliding 2-rail or 3-rail/2-rail hybrid.