page_title: List of metro systems
hierarchical_section_title: List of metro systems
caption_attribution_description: English: Formerly the "black cat", it's the only DKZ6 (stainless steel body) in Line 13 fleet.
context_page_description: 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-Bahn or undergrounds. As of December 2017, 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 Beijing Subway is the world's busiest and longest metro system, while the New York City Subway has the greatest number of stations. The country with the most metro systems is China, with 39 operational.
context_section_description: 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-Bahn or undergrounds. As of December 2017, 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 Beijing Subway is the world's busiest and longest metro system, while the New York City Subway has the greatest number of stations. The country with the most metro systems is China, with 39 operational.
caption: The Beijing Subway is the metro system with the longest route length and highest ridership.
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