Railroad car

A railroad car or railway carriage is a vehicle on a rail transport system (railroad or railway) that is used for the carrying of cargo or passengers. Cars can be coupled together into a train and hauled by one or more locomotive. Passenger cars can be self propelled in which case they can be single or multiple units.Most cars carry a "revenue" load, although "non-revenue" cars exist for the railroad's own use, such as for maintenance-of-way purposes. Such uses can generally be divided into the carriage of passengers and of freight. "Revenue" cars are basically of two types: passenger cars, or coaches, and freight cars or wagons.