These Seattle-Portland-Eugene Talgo trains normally (?) operate with a powered loco on one end and a older de-motored F40 on the other end for a control cab, so the trains don't have to be turned or run-around at the end terminals. I recently saw this train operating without a control cab on the tail end. The end "transition car" without a loco behind it gives the appearance of outrageous tailfins, reminding me of some of those automobiles of the late 50's and early 60's.
I've occasionally ridden these Talgo trains and they ride OK, but the current schedules are disappointingly slow.
The end view looks like Batman, or cat ears. Amtrak could spiff it up with some creative graphics ...
This photo from a previous year shows a de-motored F40 as normally used on one end of the train.
And an interior view of the "Bistro" car.