"Dining coach" is a term used to describe a train carriage specifically designed for dining purposes. However, there are many synonyms one can use to describe this type of carriage. Some of the most common synonym options include dining car, dining compartment, dining room, and dining saloon. Another possible synonym is restaurant car, as this type of carriage is often used as a mobile restaurant by train operators. Other related terms that can be used include food car, buffet car, and snack car. Depending on the context, any of these synonym options may be suitable to refer to a dining coach or carriage on a train.