The NTSB has effectively (though they can't officially do it) made the old Talgos unusable. WA is (according to this and other stories) trying to arrange interim replacements from Amtrak until new Talgos (that meet current crash standards) can be acquired and delivered. Once Amtrak can find enough equipment for that, the old ones are effectively scrap. So if a museum has space for one, probably as a non-operating display, great, and possibly appropriate as the train that got the Cascades service started. Otherwise, they're heading to China to become part of the next big bridge.