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[quote user="Murphy Siding"][quote user="mudchicken"]It's not the AC part of the locomotives that adds on the extra safety factor to Cooper's System, it's the "high adhesion tration motors & wheelsets" ...You ought to see what happens on some old timber trestles when there is a predominant direction of tonnage and the stringers start walking off the bents & pile caps![/quote]Is that due to the wheelsets trying to push( for lack of a better word) the rails toward the back of the train?[/quote]Or forward (if it's in dynamic braking at that point).  Think of it as a force applied longitudinally to the rail.  The rail doesn't slide and ball up in a wad somewhere because it is anchored against longitudinal movement, so it resolves the force into the ties, and the ties into the ballast.  The force can cause the track to slide out on the curves or in this case to slide the  stringers off the caps or the caps off the piles.S. Hadid
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