Here is a neat shot of a D&H pulpwood flatcar taken March 28, 1976. I don't believe that they were still being used by the D&H in 1984. I certainly haven't come across any pictures of them. It is a shame, too, as a model of one would look really great. I even started collecting twigs for a model of one years ago. The process was too tedious, so I gave up.
On a related note, last weekend the Adirondack Live Steamers had their Fall Meet. I am happy to say both my Gauge 1 live steam locomotive and my 7.25" gauge battery riding engine performed flawlessly. Had we not had other engagements later that day, I would have likely stayed up all day running my trains.
But, I did happen to see a large "log train" roll by on the mainline while I was there. We have had a lot of trees taken down and the trunks were cut up into logs that could fit (barely) on some riding cars belonging to a member. Here is a very heavily loaded log work train making the rounds.