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). Posted in Slides | Tagged 640, 677, Electro-Motive Division, GP38-2, GP38AC | Leave a comment