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None Needed
We have the Dinky, or a small railway station that takes you from campus to NJ Transit, which takes you to Trenton, New York, or wherever else one might want to go in New Jersey. Off-campus housing is practically nonexistent; in fact I don't know anyone who lives off campus except one guy who got kicked out of the dorms for throwing too many loud parties. Princeton students don't go off campus much; everything is on campus so I can't really speak for public transportation.