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I didn't notice the bridge length you were after nor the clearance over any obstacles or track beneath. If you are sufficiently high up you should consider a trestle of parallel deck girder spans. If you have little clearance beneath, you should stick with a series of through truss spans (a real 'double track' bridge as you have mentioned) or a series of double track through girder spans. If the vertical clearance beneath the bridge is small and short spans are permissable, the railroad would most likely go with the through girder option rather than the through truss option. MEI makes a girder bridge and girder parts you could use for this. Whether you use girders or trusses, make sure to make good looking bearings for your spans. It makes all the difference in the world to the bridges appearance. Good Luck - Ed
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