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O gauge used 27" radius ie O-27 gauge. Scale 2 rail O guys use big sweeping turns like HO only bigger. In HO a 22" radius is considered tight. 22" is a convienent size to use on a 4X8 and have enough room left to catch derailments. If you use 30 inch or greater radius with easements and #6 or bigger turnouts you trains will run more reliably and look better going through a corner. I use 36" radius on my mains and have no problems, but in older areas where I used 22' Snap track I have derailments and uncoupling problems. On 18" radius with #4 turnouts areas I have had so much trouble I don't run trains there and would tear them out except they are in my orginal layout and have senemental value. I didn't know better at the time and nobody warned me, so I am warning you, keep the corners big.
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