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A good rule of thumb: Up two 77 Ton Capacity - 33" wheels 100 Ton Capacity Cars - 36" wheels Over 100 Ton Capacity - 38" wheels Some intermodal cars used 28" wheels for clearance problems, also some of them used 38" and 28" mixed on the articulated stack cars. I don't know what Athearn is now using for their Covered Hopper cars now; but if you have the older blue box kits you should replace the 33" wheels with 36" wheels, this will also raise the car to the proper height so the couplers will match up with the rest of the cars. Rick
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