Quote:
Originally Posted by daepp
But aren't the two sets of drivers independent of one another with respect to their position on the tracks and to the chassis of the locomotive?
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Yup; they do move independantly - they "articulate". They are hung from one common frame under a common boiler, however, so the whole engine isn't really hinged in the middle. Typically the rear set of drivers are fixed on that frame, and the front set is free to pivot and slide in a big crescant shaped slot. The pilot truck usually pivots with that front set. It's hard to see on the real thing, as they don't move much, so here is a shot of a model locomotive with the movement exagerated:
