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[quote user="Paul_D_North_Jr"] Erik - I recall seeing the metric expressed as something like tons of axle load per inch of diameter, someplace or another quite a few years ago.  Now that I think about it, probably by John Kneiling - he often discussed wheel & axle sizes for the lighter loads of his integral train systems.    Maintaining that ratio - though probably not quite so linear for the contact area size - would go a long ways towards adjusting the axle load to match the wheel diameter, since the circumference is linear with diameter (C = D x pi, 3.14) [I know you know this - I'm just going into the details for those who might not].  For example, 33 tons on a 36" wheel = 0.92 tons/ inch diameter; 28" x 0.92 = 25.7 tons < 15 tons hypothetical. - PDN.  <div style="clear:both;"> </div> [/quote] Wheels have to comply with AAR Specification M-107/ M-208. <a href="http://www.wheels-world.com/UploadFiles/standard/AAR_M-107_M-208-2009%20%20Wheels,Carbon%20SteeL.pdf">www.wheels-world.com/UploadFiles/standard/AAR_M-107_M-208-2009%20%20Wheels,Carbon%20SteeL.pdf</a> The wheel loads are on page 31. I tried to post just a Word table with just the loads, but the editor doesn't transfer it to the post. Regards, Volker
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