KCS Gray.....??????????/

Okay, what color paint matches KCS’ gray the best? I’m looking at modeling one of their SD70MACs and can’t get a real good match. And, the '07 Walthers catalogue doesn’t have it either. Does anyone know of a Floquil, PollyScale, or the like match? Thanks

I use 2 parts UP grey and 3 or 4 parts white.