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Around 2016 I got into three rail O gauge. I decided to stick with the more "Traditional" toy side of things. Traditional three rail O can vary from tinplate toy trains to fairly realistic engines and rolling stock that can run on far tighter curves than proper O scale equipment can. So you can cram a some fairly large trains into a small space. Curves in three rail O are expressed in diameter instead of radius, so an 18" radius three rail O curve would be expressed as O36. Pic is a K Line 2-6-6-6 Allegheny. It's shrunk down from 1/48 to 1/58 scale, has blind center drivers, and unlike the prototype, the rear engine is articulated instead of fixed. It will run on O31, that is, 15.5" radius curves.
