Light rail systems are a form of urban 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 densely populated areas and share road space with cars and pedestrians. These systems can reduce traffic congestion and lower emissions by encouraging public transit use. Many cities around the world, such as Portland and San Diego, have successfully implemented light rail systems to improve mobility and accessibility for residents and visitors.