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It is probably better to recommend a minimum radius as opposed to what is the minimum radius available, as the latter can result in a minimum radius that can only be negotiated by an o-4-o industrial shunter ! MR has recommended a minimum of 24" for HO ( 3.5mm = 1' ), and as OO ( 4mm = 1', 16.5 mm track gauge ) is primarily a British scale 24" is the absolute minimum but preference should be no less than 30". The other related issue is the transition curve from the straight to the actual curve. I suggest reading John Armstrong's books on Track Planning to fully understand this and related issues. <br /> <br />Regards, sunstream2
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