The passenger train that derailed while crossing a highway bridge in Washington state, leaving three people dead, was travelling at more than double the speed limit.

The Amtrak 501 train - the first high-speed commuter service to use a new track from Seattle to Portland - was moving at 80mph in a 30mph zone, federal officials said.

A data recorder recovered from the train's rear locomotive indicated the speed at which it went off the tracks.

With about 78 passengers and five crew, the train was on a bridge over the Interstate-5 highway in Pierce County, 40m (65km) south of Seattle, 

Seattle Mayor Jenny Durkan tweeted: "This catastrophic derailment is horrific. My thoughts are with those injured & our first responders who rushed to the scene.

"The City of Seattle has offered our assistance & is ready to work with Amtrak, local, state, federal officials in the aftermath of this tragic incident."

The sheriff's office said "multiple" motorists were injured when their vehicles were hit but no fatalities have been reported.

Traffic cameras and police photos showed carriages dangling off the bridge onto the highway and others smashed onto the busy road below.

US President Donald Trump tweeted that the incident shows "more than ever" why his infrastructure plan "must be approved quickly".

Ten minutes later he added that his "thoughts and prayers are with everyone involved" in the accident.

Passenger Chris Karnes told CBS News: "We had just passed the city of DuPont and it seemed like we were going around a curve.

Amtrak carriages fell onto the highway below during the train's first journey on a new track.
Image:
It was the train's first journey on a new track
"All of a sudden, we felt this rocking and creaking noise, and it felt like we were heading down a hill.

"The next thing we know, we're being slammed into the front of our seats, windows are breaking, we stop, and there's water gushing out of the train. People were screaming.

"The tracks for this line were supposed to be upgraded to be able to handle higher speeds," he continued. "I'm not sure what happened at this juncture."

The train was using the new Point Defiance Bypass route created to avoid slow curves and "single track tunnels" on the main line tracks.

The project, which began in 2010, cost $181m (£135m), a report by the Washington State Department of Transportation revealed.

source: SKYNEWS