NS intermodal train crossing Rockville Bridge over Susquehanna river, between Marysville and Rockville, with destination Harrisburg Intermodal Yard. The Rockville Bridge, at the time of its completion in 1902, was, and remains, the longest stone masonry arch railroad viaduct in the world. Constructed between April 1900 and March 1902 by the Pennsylvania Railroad, it has forty-eight 70-foot spans, for a total length of 3,820 feet (1,160 m). Currently, the bridge is used by the Norfolk Southern Railway and Amtrak.
