This was probably the mid-1970s. I have very few photos of him at work on the railroad, and around this time he was running for political office so he may have had my Grandma down there acting as his photographer. He was a freight conductor for several years right in that late steam through second generation diesel era so many of us model.
I believe that's DDA40X. I got some more background on this and it was from his campaign literature in the 1970s when he was running for state legislature. Unlike the other guys, this actually was his job. His outfit is too clean for it to have been after a long shift.