This extremely rare surviving pin-connected truss bridge carries highway traffic next to a railway bridge, and may have a complicated history. The bridge sits next to a plate girder bridge to the south. The two bridges share piers and abutments. The north side of the truss bridge has unusual details at the connections, where unused pieces of cut metal would appear to suggest that originally something was attached to this side of the bridge at both the top and bottom of the trusses. The south side of the truss does not have these pieces of cut metal. One possible explanation for this mystery follows. Originally, this crossing was built as a single truss bridge, composed of either three or four truss lines. One portal would have served railway traffic and the other portal would have served highway traffic. At some point in history the railway needs increased and a replacement bridge for trains was needed. Typically maintaining train traffic over a crossing is more important than highway traffic. Thus, the highway truss might have been demolished and the railrway truss could have been slid over on the piers making way for the new railway bridge, the through plate girder bridge seen today. The prefabricated girders could have been set on the piers quickly once the truss was out of the way, minimizing train traffic. Again, this is all just speculation, but the fact remains that something was attached to the north side of the truss bridge seen today.
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