Railmotor, a term used to describe a self-propelled rail vehicle, has several synonyms. Some of the words that can be used interchangeably with railmotor include railcar, railbus, diesel multiple unit (DMU), and rail cruiser. These vehicles are designed to offer comfortable and convenient transportation for smaller groups of passengers, particularly in rural and suburban areas. Railcars can be powered by diesel, electricity, or hybrid sources, and have varying numbers of passenger seats, amenities, and storage space. Synonymous terms for railmotor can differ geographically, as different regions use different words to describe the same type of railway vehicle.