You'll get better answers, but here are some things to get you started:
PRR controlled LIRR, but I don't know if you want to associate LIRR's very extensive commuter operations (even the "LD" trains like the Cannon Ball were more like commuter trains in terms of where they ran and what their clientele rode them for) with the Pennsylvania's operations 'under their own name'.
The PRR had direct commuter service along its New Jersey main line, and it could be argued that much of the traffic on the 'Clockers' was 'commuting' in nature.
There were also several services from central New Jersey, notably the still-extant service to Long Branch (later shared with CNJ). Dave Klepper will know more about some of the esoteric services that were offered at various times, including some services in the area that were not "New York" oriented.
Of course the major PRR presence was in the Philadelphia area, with 'commuter' service as far as Harrisburg, Trenton, and Atlantic City.
The PRR had commuter services in areas other than New York and Philadelphia. Pittsburgh was one, the Chicago area was another, although I don't know much about either; at one time cities like Cincinnati and St Louis had at least one commuter train (if the definition of commuter train is a train timed to accommodate large numbers of people going to or coming from work).
I am very familiar with the New York Central System and their comuter trains, especially in and around New York City. I probably have 30 books about the NYC, but not being a Pennsy fan I do not have even one about them. In a nutshell did the Pennsylvania Railroad also have as extensive of a comuter system in New York City, or perhaps some other City(s)?
Thanks for the information
Paul
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