Rail transit refers to the system of trains and railways used for transporting passengers and goods. It includes various forms such as subways, light rail, and commuter trains, which operate on fixed tracks. Rail transit is an efficient mode of transportation, often reducing traffic congestion and lowering carbon emissions compared to cars. Many cities around the world, including New York City and Tokyo, have extensive rail transit networks that connect urban and suburban areas. These systems are designed to provide reliable and frequent service, making it easier for people to commute to work, school, and other destinations without relying on personal vehicles.