Amtrak wreckage Amtrak train cars lie on Interstate 5 after a derailment in DuPont, Washington, U.S., on Monday, Dec. 18, 2017. The Amtrak passenger train derailed sending rail cars plunging onto a busy interstate during the morning rush hour and resulting in injuries and deaths. (Photo: David Ryder/Bloomberg)

(Bloomberg) – The passenger rail cars on an Amtrak train that derailed near Seattle last December while traveling more than twice the posted speed, killing three people, didn't meet current crash-protection standards, federal investigators said Tuesday.

The Talgo Inc. cars had to be specially modified to make them sturdier in a collision, but they still didn't meet crash standards adopted in 1999 by the U.S. Federal Railroad Administration (FRA), according to newly released documents from the National Transportation Safety Board (NTSB).

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