GP7s 521, 575 and 529 and Caboose 247 by Frisco.org Posted on May 22, 2015 GP7s 521, 575 and 529 Caboose 247 Front and back: GP7s 521, 575 and 529 and Caboose 247 at Nichols Jct, Springfield, MO (date unknown). Thanks to Karl Brand. Posted in FT Collection | Tagged 247, 521, 529, 575, Caboose, Electro-Motive Division, GP7 | 1 Comment