I use the Acrylics now, but, the Enamels follow almost the same guidelines
Soo Line Red is a dead on match for Insignia Red 11136
Reefer White is the best White I have ever seen for the underside of USN aircraft, because it is the bright White that was actually used, instead of the "spec white" that was called for, but not used
Burlington Northern Green is the closest we can get in Acrylics to Willow Green 14187
GTW Blue is a little bit darker than True Blue 15102 (it is about 15090)
and the old fashioned pre-Model Master solution for Light Gull Gray is still SP Lettering Gray,,,,,,I still keep two bottles of that around all the time, because that plus the Reefer White lets me do a USN plane anytime I want to,,,,,,even if I end up using someone else's paints for the trim colors
I also keep bottles of Flat Aluminium and Stainless Steel around,,,,,,,,they are some of the Acrylic Metallics that "just spray" without giving me any troubles
if you can find any, the Polly Scale Military #505017 Yellow RLM 04 is a very good 13538 Orange Yellow (some call it Insignia Yellow),,,,,,,,,I didn't find the Railroad color that matches that yet,,,,,,,I have about ten more colors that I want to match up and buy at least 2 bottles of each, for Naval aircraft usage, 2 ounces of trim colors is nearly a lifetime supply
Rex