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I think the more modern 70T roller bearings are correct for these.
Seventy-ton trucks were used on all the models. Friction bearing or roller-bearing style depended upon the prototype.
Does anyone have these airslide hoppers. I know they came with either bettendorf trucks or 70 ton trucks. Trouble is, I don't know which truck style goes on which roadname. I checked the Atlas site for past N scale products, and I found a few of the hoppers I have and put the correct trucks on them. But I still have a number of hoppers w/o trucks. If you know which roadnames take which style truck, that would be a great help.
What road names are you looking for? I'll see what I can dig out for you.