Officials say the accident occurred shortly before 1 p.m. Wednesday. It involved a trespasser who was struck by an Acela Express train just west of the Hamilton Township station in Mercer County.
None of the 170 passengers and crew aboard the train were hurt. It had departed from Boston and was headed to Washington.
All service between New York and Philadelphia had been suspended after the accident occurred. But Amtrak says two of the four available tracks are now open, though all train traffic there is moving at restricted speeds.