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[quote user="mudchicken"]Rust or graffitti have no bearing on the structural integrity of most railroad bridges. [/quote] Rust has always influence on structural integrity as it lets steel sections shrink, but over a very long time within legal limits. Often steel bridges are constructed with larger steel sections than the structural design asked for to provide for some rusting. As someone said before many of the old bridges were overdesigned, if for rusting or looking forward to future higher loads or just so I can't say. But the effect is the same. At some point in the lifetime of a bridge the railroads have to decide if to build a replacement or start with corrosion protection. As many of the railroad bridges are quite old they are nearing the end of their lifespan anyway so the decision is easy. Regards, Volker
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