With nearly 40' x 50', most here would think that I would have super wide curves (O120 or better) on my layout. But that's just not the case. In order to fit as much track as I have into the space, I have gone with O72 minimum on the mainlines, with some as wide as O96.
Because when I designed the layout, I had no real interest in steam engines, I didn't leave enough space between tracks or next to walls on curves. Furthermore, the really large engines didn't even exist until it was too late to make changes.
I now own a Big Boy and a Challenger. The Big Boy may never run, too many clearance problems. The Challenger will see action, but will not be able to run on all sections of the layout.
