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Conrail Photos: Brad McClelland: https://www.facebook.com/brad.mcclelland.39/
Richard Kurtz Selma Photos: https://www.rr-fallenflags.org/prr/prr.htm
Timetables: http://prr.railfan.net/documents/PublicTimetables.html
Spirit of STL at Dayton Union: https://www.flickr.com/photos/129679309@N05/22337987830/in/photostream/
Jeffersonian at STL: https://www.railpictures.net/photo/864576/
The American at STL: https://www.american-rails.com/american.html
Penn Texas: https://condrenrails.com/PRR/PRR-E7s.html
Cincy Limited: https://www.flickr.com/photos/129679309@N05/24431948499/
Penn Central Era Passenger Trains: https://cs.trains.com/ctr/f/3/t/209262.aspx?sortorder=desc
Late National Limited: https://www.flickr.com/photos/127850938@N05/albums/72157662644219252/with/40812730633
Dayton National Limited: https://www.trains.com/ctr/railroads/passenger-service/amtrak-national-limited-service-through-the-years/
Hipes, Steve, and David P Orozi. Pennsylvania Railroad Lines West Vol. 1 Pittsburgh to St. Louis 1960-1999
Spirit of St Louis at Terre Haute: https://www.flickr.com/photos/129679309@N05/27103339634/
https://www.facebook.com/photo.php?fbid=10159219922030828&id=250788375827&set=a.339775165827 (Xenia Yard 1908)
https://www.trains.com/ctr/railroad-stories/railfan/last-ride-north-from-xenia/ (Last Streetcar North to Springfield)
A very generous donation of photos from Pennsylvania Central Depot on YouTube
https://www.rr-fallenflags.org/pc/pc.htm (Dale Colegrove)
https://www.facebook.com/photo.php?fbid=1115792312960837&set=pb.100035902366760.-2207520000&type=3