GP7 526 and GP38-2 409 by Frisco.org Posted on March 11, 2014 GP7 526 and GP38-2 409 GP7 526 and GP38-2 409 at Oklahoma City, Oklahoma in July 1974. This entry was posted in RT Collection and tagged 409, 526, Electro-Motive Division, GP38-2, GP7. Bookmark the permalink.