Most folks are fixated on minimum radius...my recommendation is to go as big as possible no matter what kind of layout you have, as long as you can still fit most of what you want on your layout. Trains not only look better they run better too. My 1st 3-rail layout had 054 (27" diameter) curves, now I have a 2-rail layout and the curves are 81 and 90". I could have gone a bit bigger but I wanted a long yard and sidings.
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