This is the only time I've ever seen an E60CH and a P42DC together (although this was SOP in the late 90s, early 00s). The train is the "Three Rivers" from New York to Pittsburgh (and on to Chicago). The P42DC was almost postively dead in consist, being ferried back to the Harrisburg pool after receiving its 92 day inspection at Rennselaer. The train was made up of Amfleet, Horizon, Viewliner and Heritage baggage cars (stuffed to the brim with mail). E60CH #600 was originally delivered as #974 in March of 1976.
