GP7s 574, 603, 539 and VO-1000 232 by Frisco.org Posted on November 2, 2017 GP7s 574, 603, 539 and VO-1000 232 GP7s 574, 603, 539 and VO-1000 232 at Fort Smith, Arkansas on February 13, 1972. This entry was posted in Slides and tagged 232, 539, 574, 603, Baldwin Locomotive Works, Electro-Motive Division, GP7, VO-1000. Bookmark the permalink.