SW9s 310 and 313 by Frisco.org Posted on January 27, 2018 SW9s 310 and 313 SW9s 310 and 313 at St. Louis, Missouri on April 20, 1980 (John Benson). This entry was posted in Slides and tagged 310, 313, Electro-Motive Division, SW9. Bookmark the permalink.