U25B 818, SD45 940 and GP38-2 673 by Frisco.org Posted on March 7, 2018 U25B 818, SD45 940 and GP38-2 673 U25B 818, SD45 940 and GP38-2 673 at Tulsa, Oklahoma in November 1975 (John Nixon). This entry was posted in Slides and tagged 673, 818, 940, Electro-Motive Division, General Electric, GP38-2, SD45, U25B. Bookmark the permalink.