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Concrete vs. Wood ties are yet another thing the amazing John McPhee discusses in his two-parter on unit coal trains from the PRB (second part, NEW YORKER issue of October 10, 2005). He says the BNSF/UP shared triple track into the PRB region uses concrete and gives a couple of reasons why. I don't think he addressed the role that rebar plays, but otherwise he seems to be pretty much right on the money.
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