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Matt, <br /> <br />Your bridge, 21 real inches long, would span about 150 ft in HO Scale. You would need a massive plate girder or a standard size truss for a span this long. What is the vertical separation between the tracks on the bridge and below the bridge? Based on what you have said, I recommend a truss. If the vertical separation is large, then I would use a deck truss, but if it is small then you could use a through truss. Is this a single track bridge? I would probably scratch build a truss from Plastruct (white) plastic shapes. They sell a plan for a through truss bridge that you could start with for your own plan. Central Valley also sells some 'Bridge girder parts' which are nice because they have rivet detail cast into them. I'll think about it some more and get back to you. <br /> <br />Good Luck - Ed
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