https://dailyhive.com/vancouver/amtrak-cascades-new-trains-interior-design-photos-testing
Of course the backwards BC segment has yet to be double tracked.
https://en.wikipedia.org/wiki/Amtrak
https://en.wikipedia.org/wiki/Amtrak#Lines
https://en.wikipedia.org/wiki/List_of_Amtrak_rolling_stock#Trainsets