Swedish X2000 train buffet cars are mostly self-service. Customers pick their food from a shelf, pay for it, and heat it themselves in a microwave oven
Indian railways buffet car.
A buffet car is a passenger car of a train, where snacks and beverages can be bought at a counter and consumed. Typically, passengers are not allowed to consume brought-along food and drinks in the car, and are therefore only able to eat in this area by buying their food in the car.