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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", "U-Bahnen" or "undergrounds". , 178 cities in 56 countries around the world host the approximately 180 metro systems that are listed here. The London Underground first opened as an "underground railway" in 1863 and its first electrified underground line opened in 1890, making it the world's oldest metro system. The metro system with the longest route length is the Shanghai Metro; the busiest one is the Beijing Subway; and the one with the most stations is the New York City Subway.
1863