Skimming the posts, I didn't see any mention of John Allen's Timesaver layout. It's a classic design, and I've seen it done (by John Coy) in 3-rail as a portable layout that is about 2' by 6'. It can be stretched or bent to fit the space. Since there aren't any sharp curves, I expect that it could be done in 2-rail O in about the same footprint.
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