Nothing’s changed in Princeton proper, although US 1 (especially from the Plainsboro line down the the Trenton border) is now all strip malls and office parks. Lots of construction, especially since the 1980s.
My hubby commuted to Newahk, he can still recite all the stops on the Pennsy from "PRINCEton JUNCtion!" to "NEWahk!" I went the other way to go to my Gaelic class at Bryn Mawr and got off at the Philly station, right after "TRINNNton!" and "NAWTH PhilaDELphia!" and took the Haverford line.