Modern Frog and Crossing Works, Chicago, Illinois; Standard facing Point Lock, Philadephia, Pennsylvania, Blueprints, 1989 January 12

Modern Frog and Crossing Works, Chicago, Illinois; Standard facing Point Lock, Philadephia, Pennsylvania, Blueprints, 1989 January 12, Box: 83, Item: 56. Institute for the History of Technology and Industrial Archaeology Records, A&M 3936. West Virginia and Regional History Center. https://archives.lib.wvu.edu/repositories/2/archival_objects/155778 Accessed November 22, 2024.