According to the Midcontinent site
here, the car, as mentioned above, was built for the South Park and evenutally joined the C&S fleet.
From midcontinent:
When the Colorado & Southern was organized in 1899, DL&G office car #2 went on the initial roster as “Official” car #011, but by the time it was relettered 16 November 1899, it had changed to B-2. It kept that designation in the C&S 1906 general renumbering, but for some reason was designated #911 in 1911.In terms of its gauge, it seems that it was a narrow gauge car, but was sometimes fitted with standard gauge trucks.
From midcontinent:
Just how business car #911 was used during the ensuing years is unknown, but it was apparently used on the C&S broad gauge lines as well as the narrow. Photo #8 shows it on standard gauge trucks, apparently being used in the 1930s as a track inspection car.In terms of its connection to the CB&Q the author says the following:
Car #911 was almost scrapped in 1938, but the cost to cut it up would have been $30, while the cost to burn it and then cut up the remaining scrap would have been $20. The low price of scrap was all that saved it. It was stored in Denver for awhile, then sometime in the mid '40s was moved to the CB&Q shops in Aurora, Illinois, where it joined coach #76, RPO #13 and 2-6-0 #9, which had been exhibited at the New York World’s Fair in 1939.
In 1948, car #911 was repainted as the “Leadville” and ran with the Mogul and the two other cars as the Deadwood Central at the Chicago Railroad Fair (1948-1949). This equipment was returned to the CB&Q shops where it stayed until 1957, when it was moved to the Black Hills Central Railroad at Hill City, SD (owned by the CB&Q). In 1988, all were donated to the Colorado Historical Society and moved to the Georgetown Loop Railroad at Silver Plume, Colorado.