GP38AC 640 and GP38-2 677 by Frisco.org Posted on July 1, 2017 GP38AC 640 and GP38-2 677 GP38AC 640 and GP38-2 677 at Tulsa, Oklahoma on July 17, 1972 (James Claflin). This entry was posted in Slides and tagged 640, 677, Electro-Motive Division, GP38-2, GP38AC. Bookmark the permalink.