Trolley systems are a form of public transportation that use electric-powered vehicles, known as trolleys or trams, to move passengers along fixed routes. These systems typically run on tracks and are often found in urban areas, providing an efficient way to navigate cities. Trolleys can be powered by overhead wires or ground-level power sources, making them environmentally friendly compared to traditional buses. Many cities around the world, such as San Francisco and Melbourne, have well-established trolley systems that connect key destinations. Trolley systems help reduce traffic congestion and lower emissions, making them a popular choice for sustainable urban transport.