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What era are you modeling? It sounds like diesel era. For that span length, the railroad would use a steel plate girder bridge. If you have adequate clearance under the track then they would use a deck girder arrangement but I think a through girder would look better. The problem is that a good model of a through girder is much more complicated to build. Can you work with brass? If you know how to solder brass, then that is what I would use. You can get brass sheet and angles to make your bridge. A quality model in brass is going to cost you though. I am certain that a styrene bridge would support the load if you want to save cash or are not comfortable working with brass. For a scale 88 ft span, the girder depth would be something like 11 scale feet deep. I guess that is close to six inches in your scale. If you use the deck girder, all the depth will be below the track. Sketch it up if you are thinking of going this way. If you are two feet above the ground (rail height) and the bridge hangs down six inches I don't think that will give you the look you want. A through girder will be about an inch and a half below the track and extend four and a half inches above the track. I think that would look better, but it will be more expensive and require more skill to build. Give it a thought and let me know which direction you want to go. Good Luck - Ed
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