By Steve Neavling
A New Jersey Transit commuter train that crashed into a Hoboken terminal last week sped up and was going twice the 10 mph speed limit, the National Transportation Safety Board said Thursday.
The findings come from a data recorder and video from the front of the train, the Associated Press reports. 
Less than a second before the crash, the train’s engineer used the emergency brake, the NTSB said.
The train was traveling 8 mph until about 38 seconds before the crash, when the throttle increased and train sped up to a maximum of 21 mph.
The train has an alert system that sounds an alarm when the train exceeds 20 mph. It’s still unclear whether the system worked.