List of metro systems

From top to bottom: The Beijing Subway is the longest metro network. Shanghai Metro is the metro system with the highest annual ridership. 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 or U-Bahn. As of 6 March 2024,^[update] 201 cities in 62 countries have a metro system.

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 Beijing Subway is the world's longest metro network at 815.2 kilometres (507 mi) and the Shanghai Metro has the highest annual ridership at 2.83 billion trips.^[3] 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 (excluding Hong Kong and Macau,).