The CSX Yn3, or "Dark Future" is a livery used by CSX Transportation since February of 2002 featured in Train Sim World. Currently, the GP38-2 featured this livery for NEC: New York since March 2018 release.
The livery features a blue locomotive with a yellow nose at the end. The CSX logo is yellow on the side and blue at the front and back heads of the locomotive. The livery is still being used by CSX and can be seen on the CSX Heavy Haul, like the Yn2 and the new Yn3b.