Jason, 315 is painted… Basic Semi-Gloss Black… Inside the cab is a “Drab Green” darker then midtone, We paint the smoke box and the stack a graphite empowered silver ( very high temp ) and about $300 per gallon. And all the accents are painted in a aluminum silver. The only white, are the lettering on the sides.
This was the standard D&RGW loco colors…
Some engines came from Baldwin with a green painted boiler shell… But only a couple…
Hopes this helps.