Chicago Burlington & Quincy Railroad GP-30 977, Naperville, IL, Nov. 29, 1963, photo by Chuck Zeiler. This was the last GP-30 delivered to the CB&Q, built September 1963 (c/n 28299). It became Burlington Northern 2254. By the date of this photo, it was 2 months old.
Sorry for the lousy photo. I shot this when I was 15, with my mom's cast off Pentax Rangefinder camera, and I could only afford black and white film. And the date of November 29, 1963 is conjecture, I dated the entire roll of film as November 30, but on the same roll of film is a shot of EMD's official demo train consisting of GP-35 #5652, a DD-35, EMD's former B-unit Test Car, another DD-35, and another GP-35, passing this very point, but running in the other direction. I'm pretty sure this DD-35 was part of that demonstrator train.
I've put out a couple of inquires to try to figure this photo out. It would appear (speculation) that the Q tested a DD-35, but most likely concluded it would not suit their needs. In theory, a single locomotive of 5000 hp was cheaper to maintain than two 2500 hp locomotives. In practice, railroads tended to look at it as taking two GP-35's out of service when only one of them was broken. Anyway, the CB&Q never rostered a DD-35.