GP7s 542, 585 and 573 by Frisco.org Posted on July 31, 2014 GP7s 542, 585 and 573 GP7s 542, 585 and 573 at the Fort Smith, Arkansas engine terminal in September 1961 (Al Chione). This entry was posted in GS Collection and tagged 542, 573, 585, Electro-Motive Division, GP7. Bookmark the permalink.