I showed my ID at the ticket counter. But when I was getting the colored tag with the car number where my coach seat was, I asked if I needed to flash my ID and the conductor said no.

By the way, nice comment on "Are you American?" I remember eons ago a discussion about what US citizens should be called since every single person from the Arctic Circle to Patagonia is an "American". I remember "USAns and USers". Maybe there were others. I guess we've sort of worked our way in the "USer" direction, haven't we? Maybe we should rename the country Freeland, and we can be "Freelanders".