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Allowing the steel reinforcement in concrete superstructures to remain exposed to the elements is a recipe for eventual failure. <br /> <br />Rain follows the re-bar into the heart of the cement, freezes and cracks the cement, cracks get bigger, allow more water in, repeat the process for a couple decades, and eventually you have serious problems. <br /> <br />Of course, the railroad can always make an appeal that the tax payers should eventually pay to replace the bridges that rusted away, afterall, how can a poor little old railroad be expected to afford a bridge, they just run trains and inspect for operational safety.
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