Reading this forum over several years it seems like there are a lot of variables involved in determining minimum curve. It seems all O gauge products, probably even high end items, have made compromises to run on tighter curves. Draw bar length, step placement, roof overhang, number and placement of driver flanges, to name a few. Probably the only way to find out what the real minimum curve is for a specific item is to buy it and try it. Or, someone on the forum already has it and can test for you.
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