GP7 506 and F7A 33 by Frisco.org Posted on August 19, 2016 GP7 506 and F7A 33 GP7 506 and F7A 33 (date and location unknown). This entry was posted in FT Collection and tagged 33, 5033, 506, Electro-Motive Division, F7A, GP7. Bookmark the permalink.
I am almost positive this is the same train shown here:
http://frisco.org/mainline/2016/01/22/gp7-505/
So the third unit would be GP7 505
Paul