Hi, Mary:
I seem to recall that in previous ventures to find this information, including the cleaning and scraping we did on Coach No.70 before we painted it, we determined that everything, including trucks and hardware, was green.
I don't know about Richard's recommendation, because I'm not at all familiar with that color, but from every indication we had the color was lighter and more green than "Pullman" green. Richard is correct that the color for C&S cars is not the same as D&RGW colors. I would suggest, using colors with which I am more familiar, something along the lines of Floquil's Coach Green.
Also, I wouldn't be shy about using a fairly light shade, as it tended to fade.
Good luck,
Mike