GP7s 546 and 527 by Frisco.org Posted on September 16, 2014 GP7s 546 and 527 GP7s 546 and 527 on a freight at Memphis, Tennessee on September 30, 1968 (Al Chione). This entry was posted in GS Collection and tagged 527, 546, Electro-Motive Division, GP7. Bookmark the permalink.