According to PC Post from January 1972:
"He's hauling an average of 30 empties plus 12 cars loaded with bales of pulp processed in the Erie plant. Traveling via Buffalo, then south into timber country, the train drops off empties at points where they can be moved to the forest collection points, and at the same time cars loaded with pulpwood are picked up. The carloads of pulp from Erie are delivered to Lock Haven, where Hammermill has a big paper mill. Returning from Lock Haven is UHP-1, with carloads of pulpwood, some of which has been ground up into chips at two locations equipped with such machinery. The train scoots north to Buffalo, then west to Erie. There the wood and chips are scooped out into big stockpiles that must be continuously replenished to keep the Hammermill pulp plant in constant operation."
There were 3 sets of this train, with pulpwood cars that MTL makes, tub gondolas for the chips similar to the Athearn Thrall gondola, and in the Conrail years there are boxcars present in photos. The usual power was 4x GP38-2s. If you find any other information from the Clinton club please let me know, Lock Haven is only 35 minutes away from where I grew up and it is on my modeling periphery.