Glad this didn't die. I have noticed that when I post a photo, a thread often immediately croaks.
I too lived along the PRR for a few years in the 1950s, in Berwyn and Rosemont. I rode the MP54s for a good six months twice daily to 30th Street station.
I also saw PRR steam - once a light run on the Trenton Cutoff - either a Mike or Dec - went by so fast it caught me by surprise - and once out of Penn Station in a coach behind a K4, going to Ocean City. That was really a surprise! 1956.