*New Amtrak Train Derails On Highway Overpass Outside of Seattle, Killing 3

[Updated 12/20/2017] Amtrak train 501, which had a scheduled departure of 6:45 am local time from Tacoma, "was part of a new service that launched Monday morning," reports CBS News. "The train is able to carry up to 250 people, but officials said there were about 75 aboard at the time of the crash." The derailment occurred in Pierce County.

‘‘The only car that is on the tracks is the rear locomotive," stated passenger Chris Karnes who was three or four cars back from the front. "There are several cars that are hanging over the overpass,’’ Karnes said in an AP report on the derailment which indicated that a "track obstruction" is seen as the likely cause. 

The Amtrak Cascades travel between Vancouver, British Columbia and Eugene, Oregon, although train 501 only travels between Seattle and Portland. December 18 was the first day for the new schedule [pdf].

The new service refers to a new route between Seattle and Portland rated for a higher speed limit of 79 mph.The older route traveled along Puget Sound and involved many curves. Radio reports indicates that the train was traveling at 80 mph on a curve before the I-5 overpass with a speed limit of 30 mph. This will likely be a major aspect of the investigation by the National Transportation Safety Board.

"Several vehicles on I-5 were struck by derailed train cars tumbling down from the tracks above," Pierce County Sheriff's Department spokesman Ed Troyer said, reports John Bacon for USA TODAY.

"We have multiple fatals on the train, no fatals on the roadway," Troyer said. He said the number of fatalities had not been determined."

"Interstate 5 southbound near Dupont, about 50 miles south of Seattle, was closed after the derailment "and will be for some time," Troyer said. He said the derailment took place at about 7:40 a.m. local time.

The new route was part of a $180.7 million project. Monday was the first day of revenue service. Radio reports indicate that news reporters had rode the train between Portland and Seattle on Friday, Dec. 15.

Amtrak Cascades trains are designed for high-speed rail service," according to Amtrak.

Amtrak Cascades trains feature a special technology that uses gravity to tilt through curves while speed is maintained. This technology shortens travel time between Seattle, Washington, and Portland, Oregon, by 25 minutes. 

[This story was updated with correct count for fatalities and correct information regarding the speed limit in the area of the crash.]