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[quote user="n2mopac"] Here are some general rules of thumb for realism based on the prototype. 36" wheels are used on 100 ton trucks--much newer, heaver equipment. They are also generally used on passenger stock I believe. 33" wheels are the standard on 70 ton trucks and lighter equipment. 28" wheels are used on height-limited equipment sometimes--especially on double-stack intermodad equipment and I think on some autoracks. As for axle lengths, Fox Valley wheelsets come in a number of lengths for different brad trucks. I believe the general rule of thumb is as follows: that .540 inch: Micro Trains; Athearn .553 inch: InterMountain; some Atlas .563 inch: Concor; some Atlas; Bachmann That said, axle lengths vary even within one brand (Atlas for example) so a good caliper used to measure the original axle length is a good idea and will save you some trial and error. Good luck, Ron <div style="clear:both;"> </div> [/quote]   This is very helpful. Thanks
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