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[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]True enough but no one seemed to get excited about it until A.C. locomotives appeared.I've seen some of those timber bridges.  Exciting!S. Hadid
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