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There's also an issue of maximum drawbar pull. Couplers can an will break if too much stress is put on them. I know some roads have a maximum number of Axles allowed on the head end of the train, which will vary with geography. BNSF IIRC also rates AC motor and high adhesion units with a conversion factor (1.5 and 1.25 IIRC) to account for their higher tractive effort per axle.
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