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Maybe I´m wrong: A bolsterless truck run better than a truck with a centerpin! A truck that has no central moving point runs better across the track than this with a pin. And I think that the Hi-Ad design allows a little "moving" of the axles. When a RR will buy a SD70MAC they have no opinion between "only bolsterless" and "bolsterless and steerable". Must order the loco with HTCR II trucks. An AC4400 coustomer has this opinion! Can order with Hi-Ad or with GE steerable trucks! UP ordered three AC4400´s with the steerable trucks, tested them and rebuilt the three locomotives with Hi-Ad´s!
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