I stumbled across a couple of pictures doing some research, and happened to notice that the D&RGW had (at least) two different strategies for painting buildings in the buff/brown era.
At Cimmaron, the "public" buildings (depot and eating house) are buff/brown, while all the service buildings are red or brown:
[
digital.denverlibrary.org]
[
digital.denverlibrary.org]
Sargent, however, has many of the service buildings (sand house, water tank, etc) also in buff/brown:
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ngdiscussion.net]
Anyway, I thought it was interesting....
Cheers,
Jeff.