Heritage streetcars or heritage trams are a part of the efforts to preserve rail traffic heritage. In addition to preserving street-running rail vehicles, heritage streetcar operations can include upkeep of historic rail infrastructure. Working heritage streetcars are closely related to the growing global heritage railway movement and form a part of the living history of rail transport.
As with modern streetcar systems, the vehicles are referred to as trams or tramcars in the United Kingdom, Australasia and certain other places (with tramway being the line or system), but as streetcars or trolleys in North America. The last two terms are often used interchangeably in the United States, with trolley being preferred in the eastern US and streetcar in Canada and the western US. In parts of the United States, internally powered buses made to resemble a streetcar are often referred to—inaccurately—as "trolleys". To avoid further confusion with trolley buses, the American Public Transportation Association (APTA) refers to them as "trolley-replica buses".
Museums, heritage tram line operators, and amateur enthusiasts can preserve original vintage vehicles or create replicas of historic vehicles to re-create or preserve streetcar technology of the past. Heritage vehicles that are kept fully functional can be used on heritage tramlines or for charter traffic.
Heritage tram lines that offer scheduled service on a certain route and showcase historic aspects of streetcar systems are usually operated by heritage vehicles. Heritage tramlines that operate on a rail network that mainly serves the interest of modern urban mobility have difficulty in exhibiting historic tramway infrastructure, apart from the car itself. This kind of tramline is often operated mainly to attract tourists instead of providing urban access. Some technical aspects of historic tram infrastructure can prevent the use of a heritage line as an integral part of the public transport system. For example, heritage tramlines often lack handicapped access which is required by law in many countries. Heritage tramlines can be either newly installed lines (created in modern times, 1970s or later) or be surviving older tramlines that have retained use of historic trams for all or most of their scheduled service.