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They use a huge wood-screw, tighten it up, then back off about a quarter turn to allow swivel. No, not really. Freight cars rest on the trucks with only their weight and a centering pin resting in a counterbore/boss arrangement to hold things in place. Derailed cars are often separated from their trucks; many newer cars have the car number stenciled on the truck frame to keep the trucks on the right car. I don't know about locos, but I expect they are similar.
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