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It really does depend on the brand of model. I'd take the manufacturer's specs as a guide only. There frequently is a difference in what the absolute minimum radius is and what the locomotive will do consisently. I run several Athearn 2-8-2's and while they will negotiate a 22" radius, they operate with less binding, steadier speed and better appearance ( less overhang) on larger curves. For these loco's, I'd be more comfortable with at least a 24" radius. Another thing to check is turnout minimum frog number, for the same reasons. I'm currently replacing a number of #6 1/2 curved turnouts with #7's to increase the radius on the inner leg of the turnouts. <br /> <br />The best thing, if possible, is to set up some track and turnouts and test for yourself to see what works and looks good enough to suit you.
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