Let me answer both of these comments.
Thanks, Dennis. I've actually been doing model railroading on again/off again for 48 years. The two scales I worked mostly were HO and 1/24 (note - I said 1/24, not G, I'll address that in a moment). Recently, I decided to try Z due to how little space it requires. Nope. 58 year old eyes, which are more suited for astronomy, cannot handle wee tiny Japanese Z scale prototypes.
I stumbled upon a Kusan battery powered set on eBay that someone had placed in the wrong category. They were asking 10 bucks for it. When it arrived, I discovered that the locomotive needs work (rebuilding the gearbox, and accidentally breaking the drive axle in the process). That's what got this all started. I have a little stretch of lawn outside my basement apartment that I'm being allowed to use for a small layout, though honestly I'm just looking for a reason to tinker. But this looks like it's going to be fun. Looking forward to a scale where I can actually see what I'm working on.
Blue, your remarks are duly noted. Certainly, I could just stay with three rail, but as I mentioned up there, I'm a tinkerer. I also prefer two rail, though at this point I'm starting to see your point.
Still, I want to give a few things here a shot. My reason for wanting to use high rail is the same as why three rail is so popular - ease of operation, especially with trains that are going to be used outside. Same for the oversized couplers, deep flanges, etc.
When I was into garden railroading, I modeled in 1/24 using G gauge track. This meant that the gauge was 3' 6", not common in the US, but common in a fair chunk of the world. My small layout was based upon a mix of US and Commonwealth gear. Most of my locomotives were battery powered kitbashes, with a number based on New Zealand prototypes. The layout was really just an excuse to build.
I'm still working this out. Right now, I'm working on getting that Kusan battery powered Beep running. I may yet go with three rail, nothing is written in stone.