The driver of the commuter train that ploughed into a station in New Jersey Thursday is being treated for serious injuries and is cooperating with the crash probe, the state's governor said.

"The engineer who was operating the train was also critically injured," New Jersey Governor Chris Christie told a news conference. "He is at a local hospital and cooperating with law enforcement officials in the investigation."

The rush hour accident in Hoboken left one person dead and 108 injured, Christie said.