DUPONT, Wash. >> When the clanging of metal and screeching stopped at first it was quiet. Then came the screams.

An Amtrak train making the first-ever run along a faster new route careened off an overpass 50 miles (81 kilometers) south of Seattle today and spilled some of its cars onto the highway below, killing at least three people, injuring dozens and crushing two vehicles. The mangled train cars ended up on top of each other – and one hung precariously over the freeway.

Attention focused on the train’s speed. Federal investigators say the train was traveling at 80 mph in a 30 mph zone when it derailed at 7:34 a.m.

Bella Dinh-Zarr, an National Transportation Safety Board member, said at tonight’s news conference that information from the event data recorder in the rear locomotive provided information about the train’s speed. Dinh-Zarr said 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.

After the crash, the injured called out as rescuers — including people who had been in cars on their morning freeway commute — rushed to help. One of the train passengers was Emma Shafer, who found herself at a 45-degree angle staring at the seats in front of her that had dislodged and swung around.

“It felt oddly silent after the actual crashing,” Shafer said. “Then there was people screaming because their leg was messed up … I don’t know if I actually heard the sirens, but they were there. A guy was like, ‘Hey, I’m Robert. We’ll get you out of here.’”

In a statement, the FBI said local police were the primary responders and there was no information suggesting “an elevated risk to Washington residents.”

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.

The chart, dated Feb. 7, was submitted to the Federal Railroad Administration in anticipation of the start of passenger service along a new bypass route that shaves off 10 minutes for the trip between Seattle and Portland, Oregon.

Kimberly Reason with Sound Transit, the Seattle-area transit agency that owns the tracks, said speed signs are posted 2 miles (3 kilometers) before the speed zone changes and just before the speed zone approaching the curve.

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.

Eric Corp, a councilman for the small city of DuPont near the derailment, said he rode the train with about 30 or so dignitaries and others on a special trip Friday before the service opened to the public today.

“Once we were coming up on that curve, the train slowed down considerably,” he said, adding that “in no way did it make me feel like we were going too fast.”

The train was not full. Authorities said there were 80 passengers and five on-duty crew members on board when it 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.

About two hours after the accident, a U.S. official who was briefed on the investigation said he was told at least six people were killed. The official said he had no new information to explain the discrepancy in the numbers. The official was not authorized to discuss the investigation publicly and spoke to the Associated Press on condition of anonymity.

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.

“I’m still figuring that out. We’ve got cars everywhere and down onto the highway,” he tells the dispatcher, who asks if everyone is OK.

Aleksander Kristiansen, a 24-year-old exchange student at the University of Washington from Copenhagen, was going to Portland to visit the city for the day.

“I was just coming out of the bathroom when the accident happened. My car just started shaking really, really badly,” he said.

The back of his train car was wide open because it had separated from the rest of the train, so he and others were able to jump out to safety.

The train was making the inaugural run on the new route as part of a $180.7 million project designed to speed up service by removing passenger trains from a route along Puget Sound that’s bogged down by curves, single-track tunnels and freight traffic.

The new bypass was built on an existing inland rail line that runs along Interstate 5 from Tacoma to DuPont, near where Train 501 derailed.