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There's a big discussion on this over in the General Discussion forum, and it seems most have 22" or less. I'll have mostly 20 - 22" on my under construction layout, with 24" in the extreme corners (it's U-shaped), and 18" where necessary. But I'm modeling the 50's, just about all 4-wheel truck diesels, so that'll be fine. <br /> <br />22 - 24" is usually the recommended minimum for big locos and cars, but some/many will run on tigher radius. They may have a lot of overhang, but if it the curve is judiciously hidden (like behind buildings or in a tunnel/mountain) it won't be noticable. You also have to watch coupling distance -- too close, and the cars could hit on the corners going around a tight curve. <br />
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