Light rail systems are a form of urban public transportation that uses trains running on tracks, often at street level. They are designed to connect various parts of a city or metropolitan area, providing a reliable and efficient way for people to travel. Light rail vehicles are typically smaller and lighter than traditional trains, allowing them to navigate through urban environments more easily. These systems often feature frequent stops and can operate in mixed traffic alongside cars and buses. Light rail is known for its lower construction costs compared to heavy rail systems, making it an attractive option for cities looking to improve public transit. Examples of light rail systems include the Portland MAX and the San Diego Trolley.