GP7 521, SW1500 352, GP15-1 109, U25B 826, B30-7 864 and GP35 727 by Frisco.org Posted on December 1, 2016 GP7 521, SW1500 352, GP15-1 109, U25B 826, B30-7 864 and GP35 727 GP7 521, SW1500 352, GP15-1 109, U25B 826, B30-7 864 and GP35 727 at Springfield, Missouri in October 1979. This entry was posted in RT Collection and tagged 109, 352, 521, 727, 826, 864, B30-7, Electro-Motive Division, General Electric, GP15-1, GP35, GP7, SW1500, U25B. Bookmark the permalink.