The Metro de Madrid is a rapid transit system serving the city of Madrid, Spain. It is one of the largest and most efficient metro networks in the world, with over 300 kilometers of track and more than 300 stations. The system began operation in 1919 and has since expanded significantly, providing essential transportation for millions of residents and visitors. The metro operates daily, offering a reliable and affordable way to navigate the city. Trains run frequently, and the network connects key areas, including business districts, tourist attractions, and residential neighborhoods. The Metro de Madrid is known for its cleanliness, safety, and accessibility.