DUPONT, Wash. -Federal investigators say the Amtrak train that derailed south of Seattle was traveling at 80 mph in a 30 mph zone.
Bella Dinh-Zarr, an NTSB board member, said at a Monday night news conference that information from the event data recorder in the rear locomotive provided information about the train's speed.
Authorities say at least three people were killed and dozens injured when the train derailed early Monday morning, spilling train cars onto a busy interstate.
Dinh-Zarr says it's not yet known what caused the train to derail and that "it's too early to tell" why it was going so fast. Federal investigators will be on the scene Tuesday.