GP7 500 and VO-1000m Units 203 and 201 by Frisco.org Posted on May 12, 2016 GP7 500 and VO-1000m Units 203 and 201 GP7 500 and VO-1000m Units 203 and 201 at Springfield, Missouri in September 1978. This entry was posted in Slides and tagged 201, 203, 500, Baldwin Locomotive Works, Electro-Motive Division, GP7, VO-1000, VO-1000m. Bookmark the permalink.