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<p>Hi Everyone,</p><p>I'm new to the site and the world of trains.  I'm currently helping out in the design of a 25 tonne underground locomotive.  Is there an AAR or RAC requirment of design for a locomotive wheelbase vs the track radii??  I've heard rules of thumb that the curve must be 10 times the wheelbase (2M wheelbase = 20M curve), but I've yet to see anthing on paper.  Can someone please help me out on this issue?</p>
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