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It is important to understand that even a thru plate girder has as much as a foot or so of steel structure under the roadbed that connects the girders and carries the weight of the roadbed and trains while it also braces the girders so that they remain vertical under the rolling loads. If it is a ballasted deck, there is also normally a layer of concrete on top of the steel that acts like a "tray" to hold the ballast. Thus, even on a thru truss, the girders still project a couple of feet below the track, not a fraction of an inch like in the typically available plastic models. <br /> <br />CJ Riley
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