The methodology is to limit in-train stress, lest they pull out a bunch of knuckles and drawbars.
So even if you see a train with a bazillion units on the headend, you won't count more than "24 powered axles" online. That means you'll definitely never see more than two of the ES44AHs online together.
I haven't memorized the other ratings, perhaps somebody who knows can chime in on the rest. Once you get beyond an SD40-2, there are plenty of units above "6 powered axles", which only have 6 physically powered axles, of course.
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