Metro trains are a type of rapid transit system designed to transport large numbers of passengers within urban areas. They operate on dedicated tracks, often underground or elevated, allowing for efficient travel without interference from road traffic. Metro systems are commonly found in major cities around the world, providing a reliable and cost-effective means of transportation. These trains typically run on a fixed schedule and serve multiple stations, making it easy for commuters to access various parts of the city. Many metro systems, such as the London Underground or New York City Subway, are known for their extensive networks and high ridership, contributing to reduced congestion and pollution in urban environments.