1) Passenger coach 
A dome car is a type of railway passenger car that has a glass dome on the top of the car where passengers can ride and see in all directions around the train. It also can include features of a coach, lounge car, dining car, sleeping car or observation. Beginning in 1945, dome cars were primarily used in the United States and Canada, though a smal...
a railroad passenger car having a dome in its roof. Cf. dome (def. 7).