{"nrhp_refnum":"79002266","name":"DDI Electric Locomotive No. 36","other_names":[],"category":"structure","location":{"address":"E of Strasburg","address_restricted":false,"city":"Strasburg","county":"Lancaster County","state":"PA","lat":39.982416870000066,"lon":-76.16077163499995,"geom_source":"nps_gis"},"listed_date":"1979-12-17","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Commerce","Transportation","Invention"],"significance_levels":["national"],"summary":{"what_it_is":"A 4-4-0+0-4-4 electric locomotive, designated DDI, built for the Pennsylvania Railroad in 1911 with its design dated 1909, located in Lancaster County, Pennsylvania. It was built for third-rail electrification into Pennsylvania Station in New York.","why_significant":"The entry describes the DDI as a classic of electric locomotive design and the only known surviving example of its type. Its one-piece cab, removable for shopping, was used on all succeeding electric classes, and its appearance as an electrified steam locomotive marks it as transitional between two competing forms of motive power.","narrative":"Built for third-rail direct-current service into Pennsylvania Station in New York, this electric locomotive is a 4-4-0+0-4-4 design dated 1911, with its design work placed in 1909. It consists of two electric units permanently coupled back to back, each with its own main frame, running gear, boxcab and leading truck. Each unit carried a 2000 horsepower Westinghouse 315-A motor, and the locomotive operated on 600-volt direct current. Mechanical construction was carried out at the railroad's Juniata Shops, while Westinghouse supplied the electrical equipment. Its one-piece cab could be removed completely for shopping, a feature used on all later electric classes of the railroad. Its outline resembled an electrified steam locomotive, reflecting its position between two competing forms of motive power. By 1911, 33 locomotive pairs had been built. It is the only known surviving example of the type, which gives it its importance within the railroad's rolling stock.","period_of_significance":null,"architect_builder":"Pennsylvania Railroad Juniata Shops (mechanical construction); Westinghouse (electrical equipment)","architectural_style":null,"criteria":[],"status_note":"Only known surviving example of its type.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:32.821297-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/79002266.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/79002266/97a34edbf5-800.webp","url_1600":"https://nationalhistoricalregister.com/media/79002266/97a34edbf5-1600.webp","licence":"Public domain","author":"Smallbones","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:RRMOP_3936.JPG\" rel=\"noopener\">Smallbones</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:RRMOP_3936.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71993151","wikipedia":"https://en.wikipedia.org/wiki/Pennsylvania_Railroad_3936_and_3937","wikidata":"https://www.wikidata.org/wiki/Q7120447"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/lancaster-county/ddi-electric-locomotive-no-36-79002266/"}