There's a thread on the Steam Era Freight Car Group about a composite gondola that looks a lot like the one in this picture. I've been trying to determine the road on this car because I'd like to model it myself. It looks like the Intermountain USRA composite gondola would be a good starting point. We'll see what the experts on the site determine.
New Britain Yard 1949.
I forget the photographer, it was from a NHRHTA calendar - one of the few I don't have!