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For the shorter, straight bridges you could use the Central Valley double track through girder bridge which is about ten inches long. Micro Engineering, Inc. makes a double track through girder bridge that is about seven inches (fifty scale feet) long if you want some variety. If the 18 inch bridge has to be a single span, then you need to get a truss bridge. As mentioned above, the Walthers double track through truss bridge may suit you, although it doesn't have adequate overhead clearance to run some of the tallest HO scale equipment. Walthers also makes a double track swing span bridge that is roughly this long and you may want to consider it for variety. The 18 inch curved double track bridge would be best modeled as a trestle of shorter spans. Micro Engineering, Inc. also makes a single track trestle kit that could be bashed into a double track trestle. In my opinion, you shouldn't cover that much span on that tight a radius with any kind of "through" structure. If you need a "through" structure because of clearances beneath the bridge, use a series of shorter girder spans, rather than a long span. Good Luck - Ed
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