I recall Tom Noel writing that the City of Denver worked hard to attract the CB&Q maintenance facility to Denver. The Q was looking to build a heavy maintenance shop on the west end, and evidently negotiated hard with the City. The location, a bit north of Denver in Adams County was quickly annexed into the City limits, and tax concessions were made to the Q as in incentive. This is almost a duplication of the effort to lure a United Airlines maintenance facility to DIA about 10 years ago.
I have seen photos of both 60 and 346 on flatcars being shipped to this shop for rebuilding. The NGDF has more on track and other locos. The Q also did some of the last rebuild of 4-8-4s there. The large locomotives look small and alone in the huge building.
[historic tidbit--Arapahoe County was split up in the early 1900s to create a consolidated City and County of Denver. Arapahoe county was split into Adams and Arapahoe Counties, with the Adams County seat being Brighton and the Arapahoe County seat moving from Denver to Littleton. The eastern portions of the former Arapahoe County were assigned to Washington and Yuma County. Now you know.]