Black box recorder recovered from New Jersey crash train

US federal investigators have recovered one of the black box recorders from the wrecked commuter train at New Jersey's Hoboken station as inquiries continue into what caused it to crash, killing one person and injuring more than 100 others.

The two event recorders could contain information on the train's speed, braking and other conditions which can help investigators determine whether the tragedy resulted from an equipment malfunction or a distracted or incapacitated engineer.