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Heres what Ive used on my rolling stock, based on prototype research (all modern cars). These are general guidelines, and my not be correct for every prototype. 57' mechanical reefer - 33" 50' covered hoppers (3&4 bay ACF centerflow, PS/PS2, FMC, trinity, etc) - 36" 60' Woodchip car - 36" 60' and 72' centerbeam flat cars - 36" 50' and 60' tank cars (some modern 40' cars also) - 36" 60' bulkhead & standard flat cars - 36" Most 50' boxcars - 33" 50' gondolas - 36" 50' and 60' Hi-Cube boxcars - 36" 89" enclosed autoracks - 28" Articulated well cars - 33" on the two outermost trucks (next to the couplers), and 36" on the articulated trucks (some prototype cars have 38" wheels here - which Intermountain makes in HO). Stand alone and drawbar connected well cars - 33" (based on my research, some may have 36" wheels) I have also noticed that sometimes the Proto 2000 wheels have a lot of side-to-side play in Athearn trucks, I have noticed this with both 33" and 36" wheels. Does anyone know of easy way to remedy this? I hope this information helps. Josh Spokane, WA
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