Originally Posted by
GoAmtrak
If the issue is that Amtrak doesn't want to give complimentary meals to the third pax, there should perhaps be a separate accommodation type on their ticket that indicates "NO MEALS" (and the dining car stewards would know that there can't be 3 meal tickets for 3 adults from the same room).
But you don't show your ticket when you're in the diner. (At least I haven't.) I've just had to sign the check with my name and room number. And what's to stop 2 people going to breakfast at 6:30 and the 3rd person at 8?

The server may not see the same room 3 times, or even if they do, may not remember there were already 2 others.