1) Passenger coach 2) Place to eat while training 3) Restaurant coach 4) Rolling restaurant 5) Where to snack on an Amtrak 
A dining car (American English) or a restaurant carriage (British English), also a diner, is a railroad passenger car that serves meals in the manner of a full-service, sit-down restaurant. It is distinct from other railroad food service cars that do not duplicate the full-service restaurant experience, such as cars in which one purchases food fro...
(from the article `railroad`) Because of its high operating costs, particularly in terms of staff, dining or restaurant car service of main meals entirely prepared and cooked in ...
[n] - a passenger car where food is served in transit
diner noun a passenger car where food is served in transit
a railroad car equipped with tables and chairs, in which meals are served.