Yes, Keith, most all of the cars are only lettered for the various "CRS Trusts" that owned them, not the D&RG. The railroad only numbered the cars to keep track of them. Presumably, as the lease of the cars was paid off, the cars were shopped and the CRS Trust series lettering was painted out.
The one exception is the boxcar in the background lettered "D&RG RW", but it is much taller than the 24 foot Billmeyer & Small design 10-ton cars. It likely was acquired outside of the Trust purchases; it may be one of the 10-ton, 28 foot cars acquired by the Santa Fe. These fifty cars, 2300-2349, were built by St Charles in 1879 and purchased when the Santa Fe was operating the D&RG.
I don't think this (tall boxcar) was one of the 27 foot, 20-ton, 1884-1891 rebuilds of the Billmeyer and Small style cars (RGS outfit car 1789 at the Colorado Railroad museum is a surviving example). The 27 footers were rebuilt from bad order 24 foot cars willy-nilly, to repair or replace cars originally purchased by various Trusts. Thus when rebuilt (or built as a replacement), they still carried their original car number and Trust designation, at least until the original bonds for the 24 footer, now 27 footer, was paid off. Eventually the cars were renumbered 4000-4099 in 1902. An example is CRS Trust series "D" boxcar number 3790, likely less than a year old:
Photo by Nathan Boyce, c1885. This car was used as a portable darkroom by Boyce as he photographed the D&RG in Colorado and Utah. Photo from Robert Sloan's opus on D&RGW narrow gauge freight cars, page 66.Now, should anyone think that I'm wandering way off topic and dangerously entering "Evil Empire" territory, the above photo was taken on the D&RG siding at Fremont Pass; the track in the background behind the boxcar is the almost new DSP&P mainline.
Jim Courtney
Poulsbo, WA