Photos show most cars with the KC system, similar to the 3000 seeries Boxcars, but not all of the 3000 series cars were changed from KD to KC systems in the 1926 rebuildings. The only D&RG drawings I have are from about 1919, perhaps someone in Colorado could check the Car Cards for the AFE's on the Reefers. I would guess that the truck levers were pretty much the same after 1926 though.
There are tracings of both the drawings which I have in Dr. Sloans Book. A photo copy of the 1926 general arrangement drawing appears in Narrowgauge Pictoral Vol 4, but it does not show the brake arrangement. The original Linen drawings should be in large collection of drawings which was donated to the DPL by Harry Sherman some years ago. Most of the parts Blue prints I have came from Alamosa car shops trash or are tracings which done for my father by John Maxwell.