The train derailed in Virginia’s Prince William Sound Monday afternoon, killing seven people and injuring dozens more, but the crash was a mystery and not a cause of the disaster, according to a federal official.
A few hours later, the NTSB issued a statement saying it would not be releasing the findings of its investigation into the crash.
Officials are still trying to piece together the train’s final moments.
Officials have said the train struck the tracks after the driver lost control and lost control of the train, prompting the driver to lose control of his vehicle.
Officials said it was not clear if the driver was drunk or had a medical issue.
The train struck a semi-truck at high speed, injuring three people and killing the driver, said Virginia State Police Lt.
Officials were searching for the driver’s body when the crash happened.
The passenger train was traveling at about 40 mph when it derailed, according a National Transportation Safety Board (NTSB) spokesman.
A tractor-trailer and trailer of semi-trailers were traveling at roughly the same speed, said the NTSD spokesman.
Officials did not say what the train was carrying or how many people were aboard.
The Amtrak train had a “very significant malfunction,” said the spokesman, who spoke on the condition of anonymity because the investigation is ongoing.
He said the crash appears to have been caused by a mechanical failure on the train.
Authorities have been unable to determine what caused the train to veer off the track, and they do not know how the driver managed to lose his grip on the control stick before the crash, according the NTSC.
Officials had said there was a mechanical problem with the train that was causing the crash and that the train could have rolled off the tracks without the driver having any control of it, the spokesman said.
The NTSB said it is conducting an investigation into whether there were any violations on the railroad.
The Federal Railroad Administration has opened an investigation.
Officials do not believe the train had any “suspicious” equipment on board, the National Transportation Transportation Safety Administration said.
But officials said that was not a prerequisite to fault the train for the accident.
“The NTSB is not an independent agency, but it does have the authority to investigate whether safety issues exist and to conduct an investigation of those safety issues,” the NTSM said in a statement.
Officials told the Associated Press the train “appeared to be a well-trained and well-motivated vehicle.”
Authorities had been investigating the cause of Monday’s crash.
The crash came less than a week after a fatal Amtrak train wreck in Pennsylvania.
Investigators said the Amtrak derailment may have been the result of a train’s brakes failing and the vehicle skidding into the tracks.
Investigators are still looking for more evidence to find out how the accident happened, and how the train came to be on the tracks, officials said.
Amtrak was supposed to depart Norfolk, Virginia, for Philadelphia on a Thursday afternoon.
The railroad had been scheduled to leave Norfolk at 5 p.m.
Officials say the train traveled more than an hour without stopping and that passengers may have fallen off the train as it went past the stop.
The incident comes as Amtrak is facing criticism over its lack of oversight over train operations.
In the wake of the accident, the Transportation Department announced it would be overhauling the safety oversight of the railroad, and the National Safety Council (NSC) has called for more accountability.
Amtrak trains have been involved in at least 12 deaths and more than 700 injuries, according and statistics from the National Institute of Standards and Technology.