The majority of 4-8-4s had 36 inch diameter Engine Truck wheels, including the MIL Road S class 4-8-4s. Some unusual examples of larger Engine Truck wheels (42" to 44" diameter) would be the SP GS class 4-8-4s and the UP FEF class 4-8-4s.
If you don't have sharp curves and/or switches, i.e. larger than 072, you should be able to changeout the factory Engine Truck wheels to the correct prototype size. If you have sharp curves, the larger, scale size, wheels will probably contact the back of the cylinders and derail the model.
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