{"nrhp_refnum":"95000543","name":"Bridge 634, Northern Central Railway","other_names":[],"category":"structure","location":{"address":"Northern Central RR tracks over unnamed rd. and Codorus Cr., Shrewsbury Township","address_restricted":false,"city":"Railroad","county":"York County","state":"PA","lat":39.773201021000034,"lon":-76.72026165599993,"geom_source":"nps_gis"},"listed_date":"1995-05-04","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Transportation","Engineering"],"significance_levels":["local"],"summary":{"what_it_is":"Bridge 634 is a single-span masonry arch railroad bridge in Shrewsbury Township, York County, Pennsylvania, on the route of the Northern Central Railway. It was constructed around 1871 to carry a double track over a roadway and Codorus Creek.","why_significant":"The nomination argues the bridge is one of very few masonry arch bridges of its kind in southern York County, spanning both a waterway and a roadway. It is also presented as the surviving early structure on a line whose other bridges were largely replaced in later widening and updating campaigns. Its association with the development of rail transport linking York County to Baltimore and Philadelphia is cited as a reason for listing.","narrative":"Bridge 634 is a single-span masonry arch railroad bridge in Shrewsbury Township, York County, Pennsylvania, built around 1871 to carry a double set of tracks of the Northern Central Railway over a roadway and Codorus Creek. Its abutments and spandrels are brown limestone ashlar, and the arch is built of stepped brownstone voussoirs. One end was originally lined with five rowlock courses of brick, though only the bricks at the eastern entrance remain intact, and the rest of the arch is now lined with corrugated metal. The nomination notes that a spanning arrangement of this kind over both water and road is uncommon on southern York County rail lines, with only two comparable examples on the route. The bridge is significant for its transportation role. The Northern Central provided a link for farmers and merchants of southern and eastern York County to markets in Baltimore and Philadelphia. The structure is also the one bridge on the line that dates from its early history, while most others were replaced during later widening. It remains in periodic freight and excursion use.","period_of_significance":"1871 - 1942","architect_builder":null,"architectural_style":null,"criteria":["A","C"],"status_note":"The railroad is used periodically for freight and train excursions, and the bridge is described as in good condition with its integrity retained despite alterations.","vacant_flag":false,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:36.731788-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/95000543.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/95000543/0e7e7fef52-800.webp","url_1600":"https://nationalhistoricalregister.com/media/95000543/0e7e7fef52-1600.webp","licence":"CC BY-SA 3.0","author":"Purple pirouette","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Bridge_634,_Northern_Central_Railway,_Shrewsbury_Twp.,_PA,_Near_Glen_Rock.jpg\" rel=\"noopener\">Purple pirouette</a>, <a href=\"https://creativecommons.org/licenses/by-sa/3.0\" rel=\"license noopener\">CC BY-SA 3.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Bridge_634,_Northern_Central_Railway,_Shrewsbury_Twp.,_PA,_Near_Glen_Rock.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71994123","wikipedia":"https://en.wikipedia.org/wiki/Bridge_634,_Northern_Central_Railway","wikidata":"https://www.wikidata.org/wiki/Q4966201"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/york-county/bridge-634-northern-central-railway-95000543/"}