NEW YORK (NYTIMES) - A New Jersey Transit train derailed as it entered Pennsylvania Station in New York on Thursday night, causing yet another round of major delays on all New Jersey Transit and Amtrak trains just days before major repairs begin at the nation's busiest transit hub.

There was no immediate indication that the derailment, which occurred around 9 pm, had caused any injuries or damage. New Jersey Transit said on Twitter that the episode was a "minor NJT derailment". Officials at Penn Station encouraged travellers to seek alternative means of transportation. Amtrak and New Jersey Transit trains share the same tracks at the station.

Rich Denison, a passenger on the train, No. 3276 on the North Jersey Coast Line, said emergency workers had boarded to check for injured passengers. He said that no one appeared to have been hurt and that it was unclear whether there had been any damage to the train.

Passengers were being held on the train until a "rescue train" could arrive, Denison said.

Transit officials said over a loudspeaker at Penn Station that the train had derailed after travelling through the Hudson River Tunnel toward the station.

Amtrak officials said passengers should expect lengthy delays. Long Island Rail Road trains, which also operate at the station, were not affected.

At Penn Station, a crowd of people filled the concourse and voiced frustration over another disruptive episode there. Peter Everett, who said he was waiting for his girlfriend to arrive on an Amtrak train, said he was not surprised by the derailment.

"This is crazy," Everett said. He said his girlfriend's train had entered the station but passengers were not being allowed to get off.

The derailment came days before eight weeks of substantial repairs are to begin at the aging station.