Old bridge (The one this listing is for) on the left, Curent bridge on the right.
Photo provided by Hank Zaletel
License: Creative Commons Attribution-NonCommercial-NoDerivs (CC BY-NC-ND)
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BH Photo #249325
From the link in the sources.
In preparing to respond to Luke regarding Rust & Coolidge vs. Keystone, I poked around the site looking at examples of each. In looking at the image for this listing, I'm pretty certain that the little Pratt truss on left looks to have a Rust & Coolidge plaque. Also, its either very advanced for 1874 or its newer than 1874.
Anyone have more info on this crossing?