The vast majority of

rapid transit Rapid transit or mass rapid transit (MRT), also known as heavy rail or metro, is a type of high-capacity public transport generally found in urban areas. A rapid transit system that primarily or traditionally runs below the surface may be ...

systems use . Some of the largest and oldest subway systems in the world use standard gauge in agreement with the country wide dominant usage for track gauge, e.g.

London Underground The London Underground (also known simply as the Underground or by its nickname the Tube) is a rapid transit system serving Greater London and some parts of the adjacent counties of Buckinghamshire, Essex and Hertfordshire in England. The ...

(1863),

Chicago "L" The Chicago "L" (short for "elevated") is the rapid transit system serving the city of Chicago and some of its surrounding suburbs in the U.S. state of Illinois. Operated by the Chicago Transit Authority (CTA), it is the fourth-largest rapid tr ...

(1892), Vienna Metro (1898),

Paris Métro The Paris Métro (french: Métro de Paris ; short for Métropolitain ) is a rapid transit system in the Paris metropolitan area, France. A symbol of the city, it is known for its density within the capital's territorial limits, uniform architec ...

(1900),

Berlin U-Bahn The Berlin U-Bahn (; short for , "underground railway") is a rapid transit system in Berlin, the capital and largest city of Germany, and a major part of the city's public transport system. Together with the S-Bahn, a network of suburban tra ...

(1902),

New York City Subway The New York City Subway is a rapid transit system owned by the government of New York City and leased to the New York City Transit Authority, an affiliate agency of the state-run Metropolitan Transportation Authority (MTA). Opened on October ...

(1904),

Stockholm Metro The Stockholm metro ( sv, Stockholms tunnelbana) is a rapid transit system in Stockholm, Sweden. The first line opened in 1950, and today the system has 100 stations in use, of which 47 are underground and 53 above ground. There are three col ...

(1950),

Milan Metro The Milan Metro ( it, Metropolitana di Milano) is the rapid transit system serving Milan, Italy, operated by Azienda Trasporti Milanesi. The network consists of 5 lines, identified by different numbers and colours, with a total network length ...

(1964), Mexico City Metro (1969),

Beijing Subway The Beijing Subway is the rapid transit system of Beijing Municipality that consists of 25 lines including 20 rapid transit lines, two airport rail links, one maglev line and 2 light rail lines, and 463 stations. The rail network extends ...

(1971),

Seoul Metropolitan Subway The Seoul Metropolitan Subway is a metropolitan railway system consisting of 23 rapid transit, light metro, commuter rail and people mover lines located in northwest South Korea. The system serves most of the Seoul Metropolitan Area inc ...

(1974),

Shanghai Metro The Shanghai Metro (; Shanghainese: ''Zaon6he5 Di6thiq7'') is a rapid transit system in Shanghai, operating urban and suburban transit services to 14 of its 16 municipal districts and to Kunshan, Jiangsu Province. Served as a part of Shang ...

(1993),

Guangzhou Metro The Guangzhou Metro () ( and ) is the rapid transit system of the city of Guangzhou in Guangdong Province of China. It is operated by the state-owned Guangzhou Metro Corporation and was the fourth metro system to be built in mainland China, af ...

(1997),

Shenzhen Metro The Shenzhen Metro () is the rapid transit system for the city of Shenzhen in Guangdong province, China. Extensions opened on 28 November 2022 put the network at of trackage, operating on 15 lines with 345 stations. Shenzhen Metro is the 6th ...

(2004). Many rapid transit systems in countries where the main lines do not use standard gauges are built in standard gauge, including the

Barcelona Metro The Barcelona Metro (Catalan and Spanish: ) is an extensive network of rapid transit electrified railway lines that run mostly underground in central Barcelona and into the city's suburbs. It is part of the larger public transport s ...

Santiago Metro The Santiago Metro ( es, Metro de Santiago) is a rapid transit system serving the city of Santiago, the capital of Chile. It currently consists of seven lines (numbered 1-6 and 4A), 136 stations, and of revenue route. The system is managed by ...

Taipei Metro Taipei Mass Rapid Transit (MRT), branded as Metro Taipei, is a rapid transit system serving the areas of Taipei and New Taipei in Taiwan, operated by the government-owned Taipei Rapid Transit Corporation, which also operates the Maokong Gondo ...

, and many systems in

India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area, the List of countries and dependencies by population, second-most populous ...

. There are also systems that use (some systems in

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the n ...

and

Jakarta MRT The Jakarta Mass Rapid Transit ( id, Moda Raya Terpadu ''Jakarta'') or Jakarta MRT (, stylized as ''mrt jakarta'') is a rapid transit system in Jakarta, the capital city of Indonesia. The system is operated by PT Mass Rapid Transit Jakarta (Per ...

), (the standard in former

Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen nationa ...

), (the standard in

Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...

) and few others. Some systems use

rubber tires A tire (American English) or tyre (British English) is a ring-shaped component that surrounds a wheel's rim to transfer a vehicle's load from the axle through the wheel to the ground and to provide traction on the surface over which t ...

, with some ones adding them to the normal steel wheels (e.g.

Paris Metro Paris () is the capital and most populous city of France, with an estimated population of 2,165,423 residents in 2019 in an area of more than 105 km² (41 sq mi), making it the 30th most densely populated city in the world in 2020. Si ...

, Mexico City Metro,

Montreal Metro The Montreal Metro (french: Métro de Montréal) is a rubber-tired underground rapid transit system serving Greater Montreal, Quebec, Canada. The metro, operated by the Société de transport de Montréal (STM), was inaugurated on October 14, ...

) and some others with only tires (e.g.

Lille Metro The Lille Metro (french: Métro de Lille) is a driverless light metro system located in Lille, France. It was opened on 25 April 1983 and was the first to use the VAL (french: véhicule automatique léger, en, light automated vehicle) sys ...

, Sapporo Municipal Subway). Some systems use monorail, the largest ones are in

Chongqing Rail Transit The Chongqing Rail Transit (branded as CRT; also known as Chongqing Metro) is the rapid transit system in the city of Chongqing, China. In operation since 2005, it serves the transportation needs of the city's main business and entertainment d ...

and in

São Paulo Metro The São Paulo Metro ( pt, Metrô de São Paulo, ), commonly called the ''Metrô'' () is one of the urban railways that serves the city of São Paulo, alongside the São Paulo Metropolitan Trains Company (CPTM), forming the largest metropolit ...

. For references for the figures, see each system's page and

List of metro systems 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. , 205 cities in 61 countries have a metro system. The Londo ...

. __TOC__ *

References

{{Reflist Rapid transit Track gauges Rapid transit track gauges

See also

References