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You will always find exceptions to any rule. First the rule: It's not a matter of axles, it's more a matter of gearing. Usually B-B road power (4-wheel trucks) were geared lower for higher top speeds. They had their maximum usable horsepower in the 40-60 MPH range. They were at their best pulling lighter loads at higher speeds, like intermodal and TOFC. Again, usually, C-C road power (6-wheel trucks) was geared higher so their mamimum horsepower came in at much lower speeds like 15-40 mph. These were designed to pull heavy tonage, like coal or ore. Can you run them together? Yes! Many railroads did, especially when power shortages hit. You would use anything that can pull, to make the tonage go out. MOPAC 1
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