One other thought on going 2-rail. Why do most HO trains run on 18" radius, but 2-rail O scale trains need like O96 (48" radius) or O108 (54" radius)? In O, the equivalent to 18" radius is 33". A few I've seen need 22", but even that is like 40" in O scale. Therefore O72 to me seems like it should be doable for a minimum radius in 2-rail O.
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