List of metro systems

From top to bottom: Shanghai Metro is the metro system with the longest metro network and the highest annual ridership in the world. The New York City Subway has the most stations in the world. The London Underground is the oldest metro system.

This list of metro systems includes electrified rapid transit train systems worldwide. In some parts of the world, metro systems are referred to as subways, undergrounds, tubes, mass rapid transit (MRT), metrô or U-Bahn. As of 22 December 2024,^[update] 204 cities in 63 countries operate 884 metro lines.

The London Underground first opened as an underground railway in 1863 and its first electrified underground line opened in 1890,^[1] making it the world's oldest metro system.^[2] The Shanghai Metro is both the world's longest metro network at 896 kilometres (557 mi) and the busiest with the highest annual ridership reaching approximately 2.83 billion passenger trips.^{[3] [4]} The New York City Subway has the greatest number of stations. As of 2024,^[update] the country with the most metro systems is China, with 54 in operation, including 11 of the 12 longest networks in the world.