Tram lines are tracks laid on city streets that allow trams, or streetcars, to travel along designated routes. These tracks are typically made of steel and are embedded in the road surface, enabling trams to operate alongside other vehicles. Tram systems are often used in urban areas to provide public transportation, helping to reduce traffic congestion and pollution. Trams run on electricity, usually supplied through overhead wires or ground-level power systems. They stop at designated stations to pick up and drop off passengers, making them a convenient option for commuting. Cities like San Francisco and Melbourne have well-developed tram networks that serve as vital components of their public transport systems.