@Rusty Traque posted:
The official color for the Santa Fe's smokebox is a color called "Tarpan Gray," which is more gray than graphite (Available from Tru-Color Paints, TCP-333) but is not a "battleship" gray.
However, like everything else in prototype photo's, its color varies depending on conditions.
I've got color pictures of in service ATSF steam and the smoke box color varies depending on lighting, when it was applied, and the angle of the camera. Silver is too light in any case, but when I paint my ATSF steam locomotives I use a gray graphite color that is probably a little too dark, but looks good to my eye.