Originally Posted by
AlanB
OZ,
...
They are also responsible for opening the door at each stop where passengers may be boarding or detraining; bringing meals to those who request it (extra tip required for this); and your safety.
To be clear, at no time are tips "required" on Amtrak. While an extra tip may be appropriate if you have your meals served in the room, that is one of the services provided by the attendant on request, and tipping is the choice of the passenger.