NTSB: Inadequate planning, training caused Amtrak 501 wreck
Failure to provide an effective mitigation method for a hazardous curve and inadequate training of a locomotive engineer is what led to the derailment of an Amtrak passenger train that hurtled off a railroad bridge and onto a busy highway in DuPont, Wash., on the morning of Dec. 18, 2017, according to the National Transportation Safety Board (NTSB).