Trolley lines are an essential means of transportation in cities, using electrically-powered vehicles along tracks. Synonyms for trolley lines include tramway, streetcar line, light rail, and rapid transit. Tramway is a term used more commonly in Europe, while streetcar line refers to the traditional trolleys of the past. Light rail and rapid transit can both mean modern, faster-moving trolleys that operate on tracks separated from car traffic. No matter the term used, trolley lines have helped shape the transportation infrastructure of many cities around the world, providing efficient and environmentally-friendly transit options for commuters and visitors alike.