Metro rail systems are urban transit networks that use trains to transport passengers within cities and their suburbs. These systems typically operate on dedicated tracks, allowing for efficient and rapid movement, often reducing traffic congestion. They are designed to connect key areas such as business districts, residential neighborhoods, and major transportation hubs. Metro systems are usually powered by electricity and can include various types of trains, such as subways, light rail, and commuter trains. Many cities around the world, including New York City, London, and Tokyo, have developed extensive metro networks to enhance public transportation and promote sustainable urban mobility.