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Think about a short bridge on it's own piers. Then another short section that sorta leaves the first at a angle to follow the track. Then a third section... each section on it's own piers for as many sections as needed to complete the curve. The width of the bridge deck would also need to be pretty wide. A bridge made for a double track will allow a curve on it. Single strack bridge sections may be too "thin" and your curve and equiptment may fall off or bind on the sides. I have noticed engineering of supports much stronger on the outside radius of curved bridges. Apparently the centrifugal force is pretty significant in the prototype. Problems include overhang of cars on both the inside of the curve and the outside of the curves. The clearence of the height of the cars as well. Basically your curve could be carried by a series of bridges. IF you used a wooden trestle you could custom build one to match your curve, and same goes for a masnory bridge.
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