Thanks guys for your help. I am now confident that this was the D&RG Depot,1880.
It was mentioned that in 1881 the D&RG were operating from between 11th and 12th Wynkoop.
I would like to show you some more W H Jackson photos that altogether suggest that the photos were taken in 1880.
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cdm16079.contentdm.oclc.org]
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cdm16079.contentdm.oclc.org]
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cdm16079.contentdm.oclc.org]
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cdm16079.contentdm.oclc.org]
The first link is the same as the first link I posted.
The second, fourth and fifth links each show the grounds of the Union Station. Clearly, looking at the rubble, timber piles and frames for constructing the Stations arched windows and doorways, the station has only recently opened. There is no signage along the walls as appears in the third photo dated 1884. Workers equipment can be seen along the edge of the building on a very narrow boardwalk.
I guess that the station must be open due to appearance of coaches behind the D&RG depot and the lack of same in the Kansas/Union Pacific yards.
By the way, the first two images were definitely taken on the same day as the cars in the rail yards are the same.
Just wondering about the chimneys beyond the D&RG depot. Would they be kilns of some sort? And the yard beyond the chimneys and string of cars. Would that have been the Masons yards for cutting stone to build the Union Station?
In all, these are very revealing images!
John
Ps.. I am still hoping that folks will use the track as a yardstick to estimate the length of the D&RG depot.