Rockville Bridge
…Rockville Bridge is the longest stone masonry arch railroad viaduct ever built, at 3,820 feet (1,160 m). It has 48 70-foot spans. The bridge crosses the Susquehanna River about 2 miles (3 km) north of Harrisburg, Pennsylvania, United States. The eastern end is located in Rockville and the western end is in Marysville…