The EMD GP20D was the product of a unique partnership between EMD and Caterpillar built by Motive Power Industries. The GP20D used Kato generators, dynamic brakes and CAT 3516 prime movers. The prime movers were branded by EMD as the 16-170B20-T1. A total of 40, CEFX 2001-2040, were built for Citi Leasing in 2000-01.
Most are on lease to UP, some have been dealt to Rail America's CORP. It is unclear if these units will be returned by G&W.