Interestingly here on Long Island, NY we have the NY and Atlantic RR which is a freight operator who leases LIRR tracks. They move freight between mainland freight tracks in New York City all the way out to the "forks". They even revived some abandoned LIRR tracks in NYC and LI.
It's amusing to see a small freight train come rolling through a passenger station with platform. I don't know how they squeeze them in, probably only run off-peak.