Hey,
So I was thinking about my up coming St. Maries River Railroad GP-9 build. I was thinking about paint. When I was doing the STMA in HO I came across a website that had various paint formulas for different prototypes. I was able to find a website that compiled four lists that included the paint formula I was looking for. I figured I would pass it on.
http://railfonts.com/Reference/Floquil_Master.html
I now when I was doing the HO I found the STMA colors to be pretty well spot on.
It includes so generic colors for weathering and some for various Russian Iron (planished ?)