Federal investigators will be looking into why a Long Island Rail Road commuter train was traveling erratically at twice the speed limit when it crashed at a rail terminal, injuring more than 100 people.
National Transportation Safety Board investigator Ted Turpin says the train had been traveling at least 10 mph when it slammed into the end of a platform at Atlantic Terminal in Brooklyn Wednesday morning; the terminal's speed limit is 5 mph.
A U.S. official briefed on the investigation says the train erratically changed speeds in the three minutes before the crash, accelerating and decelerating between 2 and 10 mph.
The official was not authorized to speak publicly about the investigation and spoke on the condition of anonymity.
Federal investigators will test the engineer for sleep apnea.