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Polyjim, <br /> <br />Your 24 inch span converts to 175 ft in HO Scale. If this needs to be a 'clear span' then you need a little more for the bearings at each end. A truss is the right structure for this span. If you have the clearance under the bridge, I think a deck truss is very impressive but most of us don't have the clearance under the bridge so we build thru trusses. Is your bridge double track or single track? Do you want a thru truss or a deck truss? How do you feel about scratch building or kit bashing? <br /> <br />Catch you later. - Ed
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