Attention quickly turned to the train's speed. A website that maps location and speed using data from Amtrak's train tracker app showed the train was going 81.1 mph (129 kph) about a quarter of a mile from the point where it derailed, where the speed limit is significantly lower.
There were 80 passengers and five on duty crew when the train derailed and pulled 13 cars off the tracks. Authorities said there were three confirmed deaths. More than 70 people were taken for medical care including 10 with serious injuries.
The official was not authorized to discuss the investigation publicly and spoke to The Associated Press on condition of anonymity.
A track chart prepared by the Washington State Department of Transportation shows the maximum speed drops from 79 mph (127 kph) to 30 mph (48 kph) for passenger trains just before the tracks curve to cross Interstate 5, which is where the train went off the tracks.
It was not clear how fast the train was moving at the precise moment when it derailed. National Transportation Safety Board investigators were at the scene trying to determine the derailment's cause.
Kimberly Reason with Sound Transit, the Seattle-area transit agency that owns the tracks, confirmed to the AP that the speed limit at the point where the train derailed is 30 mph (48 kph). Speed signs are posted two miles before the speed zone and just before the speed zone approaching the curve, she said.
He spoke on a conference call with reporters, said he was "deeply saddened by all that has happened today."
Bob Chipkevich, a former NTSB director of railroad, pipeline and hazardous materials investigations, told The Seattle Times the crash looked like a high-speed derailment based on television images.
In a radio transmission immediately after the accident, the conductor can be heard saying the train was coming around a corner and was crossing a bridge that passed over Interstate 5 when it derailed. Dispatch audio also indicated that the engineer survived with bleeding from the head and both eyes swollen shut.
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