Sorry I didn't see this post earlier, Chuck. I am getting close to having them all, and I feel like I'm pretty well in touch with what Atlas produced.
Atlas made FOUR different commemorative sets:
3009017 was a 12-car CB&Q set. I can list the road names if you like.
3009018 was a 12-car D&RGW set.
Set A:
Silver Antelope D&RGW #1100 Baggage [1]
Silver Shop D&RGW #1140 Dome-Buffet-Lounge [5]
Silver Banquet D&RGW #1115 Dining Car [6]
Silver Pine D&RGW #1121 16 Section Sleeper [10]
Set B:
Silver Bronco D&RGW #1105 Dome Chair Coach [2]
Silver Pony D&RGW #1108 Dome Chair Coach [3]
Silver Mustang D&RGW #1107 Dome Chair Coach [4]
Silver Gull D&RGW #1135 6/5 Sleeper [7]
Set C:
Silver Creek D&RGW #1133 10/6 Sleeper [?] (P&D)
Silver Pass D&RGW #1130 10/6 Sleeper [9] (P&D)
Silver Gorge D&RGW #1132 10/6 Sleeper [11] (P&D)
Silver Sky D&RGW #1145 Dome-Buffet-Lounge-Observation [12]
3009019 was a 12-car WP set.
3009020 was a 12-car CB&Q set (available only to member of the Golden Spike Club).
In addition to the 12-cars in the commemorative set, Atlas made the following D&RGW cars.
Silver Aspen D&RGW #1120 16 Section Sleeper
Silver Colt D&RGW #1106 Dome-Chair Car
Silver Glacier D&RGW #1134 10/6 Sleeper
Silver Summit D&RGW #1131 10/6 Sleeper
So 16 cars for the D&RGW, as far as I can tell. And I have seen this totol of 16 in enough sources that I believe it to be true.
Silver Antelope, part of the 12-car commemorative set, had been previously released as a stand alone car in 2015, 3009002-1.
Silver Aspen was released as a stand alone car in 2013, 3002187-1.
Silver Banquet, part of the 12-car commemorative set, had been previously released as a stand alone car in 2013, 3002192-1.
Silver Bronco, part of the 12-car commemorative set, was oringally released as a stand alone car in 2010, 3002152-1, and was one of the infamous "bad window" cars. Then it was re-released as a stand alone car in 2016, with the same part number, 3002152-1, just months before being released as part of the commemorative set.
Silver Colt was released as a stand alone car in 2016, 3009013-1.
Silver Creek, part of the 12-car commemorative set, had been previously released as a stand alone car in 2010, 3002177-1, also one of the infamous "bad window" cars.
Silver Glacier was released as a stand alone car in 2012, 3002177-4.
Silver Gorge was only released as part of the commemorative set.
Silver Gull, part of the 12-car commemorative set, had been previously released as a stand alone car in 2014, 3002197-1.
Silver Mustang was only released as part of the commemorative set. Mustang was later an Amtrak car, but never produced in Amtrak colors by Atlas.
Silver Pass, part of the 12-car commemorative set, had been previously released as a stand alone car in 2010, 3002177-2, also one of the infamous "bad window" cars.
Silver Pine was only released as part of the commemorative set.
Silver Pony, part of the 12-car commemorative set, was oringally released as a stand alone car in 2010, 3002152-2, also one of the infamous "bad window" cars. Then it was re-released as a stand alone car in 2016, with the same part number, 3002152-2, just months before being released as part of the commemorative set. Pony was later an Amtrak car and an Alaska RR car, but was not produced in either of those colors by Atlas.
Silver Shop, part of the 12-car commemorative set, had been previously released as a stand alone car in 2015, 3009007-1.
Silver Sky, part of the 12-car commemorative set, had been previously released as a stand alone car in 2014, 3002158-1.
Silver Summit was released as a stand alone car in 2012, 3002177-3.
I think that's all I've got on the D&RGW cars. Of course Atlas also made a bunch of F-3s and F-7s in D&RGW colors that could be used to pull these beautiful cars.