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Since nobody has given "my" answer yet, here it is: Assuming you are asking about [older] steel bridges, the railoads generally prefer bridges with the supporting structure below the tracks, as it is cheaper. The weight of the train is transferred via the rails to the ties, so the structure thoretically has to be no wider than the ties - the rest, i.e. walkways etc. is "cosmetic". If clearance below is a problem, they go to a steel structure above the rails, but this neccessitates cross girders to take the weight to the outside of the train, i.e. 12 - 15 ft wide, more if there are walkways etc. These structures are normally not designed to keep derailed equipment on the roadway, as well maintained trains on well maintained roadbeds proceeding at the prescribed speed do not derail. <br /> <br />[Sorry, no decorations, this is my first comment] <br /> <br />PAC in Canada.
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