Leonard F Shaner Jr posted three photos with the comment:
Pottstown, PA.The first iron truss bridge in the United States. Built in 1845.Pottstown Historic Society.
Bill Stephens: Does it still exist, and is it still in use?
Leonard F Shaner Jr: no, some of it is at the Railroad Museum of Pennsylvania, though.
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The bridge on which the John Bull locomotive in the Smithsonian is displayed is of similar design.
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