The Pennsylvania Railroad Company was the largest railroad in the United States in terms of corporate assets and traffic from the last quarter of the nineteenth century until the decline of the northeast's and midwest's dominance of manufacturing. This collection consists of materials related to the Pennsylvania Railroad bridge and trestle near Phoenixville, Pennsylvania. There is a copy of an erection diagram from 1896 and a copy of the application for the bridge to be a historic site to the National Register of Historic Places in 1976.