A railway-car fitted up as a dining-room or restaurant, and supplied with a kitchen, pantry, refrigerator, etc.(noun)
The Century Dictionary (Public Domain)
Use "dining-car" in a sentence
"For some, there's nothing more comforting than a dining-car shaped diner."
"The comfort and style of the old San Francisco Chief, wedded to 200+ mph speed and the luxuries of space to walk around, a window that actually looks out at something and a dining-car instead of a pull-down tray."
"In the summers, he worked as a dining-car waiter, like his father and grandfather before him."