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), métro or U-Bahn. As of 21December2025,[update] 211 cities in 63 countries operate 939 metro lines.
Record-breakers from top to bottom: The Shanghai Metro has the highest annual ridership in the world. The Beijing Subway is the largest system in the world by total track length. The London Underground is the world's oldest metro system.
The London Underground first opened as an underground railway in 1863 and its first electrified underground line, the City and South London Railway, opened in 1890,[1] making it the world's first deep-level electric metro system.[2] The Budapest Millennium Underground Railway, which opened in 1896, was the world's first electric underground railway specifically designed for urban transportation and is still in operation today.[3][ISBNmissing] The Beijing Subway is the world's longest metro network at 879 kilometres (546mi) and the busiest one with annual ridership approximately 2.83 billion passenger trips.[4][5]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.
Considerations
The International Association of Public Transport (L'Union Internationale des Transports Publics, or UITP) defines metro systems as urban passenger transport systems, "operated on their own right of way and segregated from general road and pedestrian traffic".[6][7] The terms heavy rail (mainly in North America) and heavy urban rail are essentially synonymous with the term "metro".[8][9][10] Heavy rail systems are also specifically defined as an "electric railway".[8][9]
In contrast to commuter rail or light rail, metro systems are primarily used for transport within a city, and have higher service frequencies and substantially higher passenger volume capacities. Most metro systems do not share tracks with freight trains or inter-city rail services. It is not relevant whether the system runs on steel wheels or rubber tyres, or if the power supply is from a third rail or overhead line.
The name of the system is not a criterion for inclusion or exclusion. Some cities use "metro" as a brand name for a transit line with no component of rapid transit whatsoever. Similarly, there are systems branded "light rail" that meet every criterion for being a rapid transit system. Some systems also incorporate light metro or light rail lines as part of the larger system under a common name. These are listed, but the light rail lines are not counted in the provided network data.
Certain transit networks may match the service standards of metro systems, but reach far out of the city and are sometimes known as S-Bahn, suburban, regional or commuter rail. These are not included in this list. Neither are funicular systems, or people movers, such as amusement park, ski resort and airport transport systems.
This list counts metros separately when multiple metros in one city or metropolitan area have separate owners or operating companies. This list expressly does not aim at representing the size and scope of the total rapid transit network of a certain city or metropolitan area. The data in this list should not be used to infer the size of a city's, region's, or country's urban rail transit systems, or to establish a ranking.
The most common English name of the metro system (including a link to the article for that system).
Year opened
Metro systems of world as of 2025
Operational
Under Construction
The year the metro system was opened for commercial service at metro standards. In other words, parts of the system may be older, but as parts of a former light rail or commuter rail network, so the year that the system obtained metro standards (most notably electrification) is the one listed.
Year of last expansion
The last time the system length or number of stations in the metro system was expanded.
Stations
The number of stations in the metro network, with stations connected by transfer counted as one.
System length
The system length of a metro network is the sum of the lengths of all routes in the rail network in kilometers or miles. Each route is counted only once, regardless of how many lines pass over it, and regardless of whether it is single-track or multi-track, single carriageway or dual carriageway.
Ridership
The number of unique journeys on the metro system every year. There is a major discrepancy between the ridership figures: some metro systems count transferring between lines as multiple journeys, but others do not. Numbers may also be counted via different methods – faregates/turnstiles or light barriers at entrances or vehicle doors being the most common but far from the only ones.
This list is sortable. Click on the icon in the column header to change sort key and sort order.Note: This list may not be fully representative, as yearly ridership numbers during the COVID-19 pandemic are shown for some systems, while others have numbers from previous years.
The following is a list of new worldwide metro systems that are currently actively under construction. In some cases it is not clear if the system will be considered a full metro system once it begins operational service. Only metro systems under construction are listed where there are no metro systems currently in operation in the same city.
The countries of Ivory Coast, Israel, and Serbia are currently constructing their first ever metro systems.
Line A opened in stages between 1913 and 1914 by the Anglo-Argentine Tramways Company. Line A services continued as above-ground tram services through an access ramp at Primera Junta Station. Subway-surface services into Line A ceased in 1926, with the line and its rolling stock transitioned into pure rapid transit operation by 1927.[14][15]
The number is 78 if interchange stations (i.e. different sets of platforms) are counted as one station, or 90 if all stations on all lines are counted multiple times for each line.
Vienna's Metropolitan Railway (Wiener Stadtbahn) first opened for service in 1898, operating steam locomotive trains on mostly elevated or underground ROWs. From 1976 onwards, part of it was integrated into the newly established Vienna U-Bahn system (lines U4 and U6), operating as a modern metro.
The number of stations is 25 if interchange stations (i.e. different sets of platforms in a single complex) are counted as one station, or 27 if all stations on all lines are counted each.
The number of stations is 33 if interchange stations (i.e. different sets of platforms in a single complex) are counted as one station, or 36 if all stations on all lines are counted each.
The number is 126 if interchange stations (i.e. different sets of platforms) are counted as one station, or 143 if all stations on all lines are counted multiple times for each line.
The Beijing Subway's first line began trial operations on 1 October 1969. It opened to revenue service under trial operations on 15 January 1971. Initially, only members of the public with credential letters from their work units could purchase tickets, but this restriction was removed on 27 December 1972. The subway line passed its final inspections and ended trial operations on 15 September 1981. During the trial operations period, annual ridership rose from 8.28 million in 1971 to 55.2 million in 1980. See the history section of the Beijing Subway for details and references.
The number of stations is 404 if the 104 (95 2-line, 9 3-line) interchange stations (i.e. different sets of platforms) are counted as one station, or 517 if all stations on all lines are counted multiple times for each line. Bajiao Amusement Park on Line 1 (closed for the construction of Line 1 Branch, from June 2025 to May 2027)[75][76] is not counted during renovation, so the active stations are 404. Out-of-station interchange stations with same name (e.g. Dazhong Si; Muxidi), are counted as one station. Capital Airport Express and Daxing Airport Express lines and stations are counted, despite being an express service with separate fares. Both counts exclude the 20 stations of the Xijiao and Line T1 tram lines.[77]
There are 363 stations if the 85 (78 2-line, 7 3-line) interchange stations (i.e. different sets of platforms) are counted as one station. There are 448 stations if all stations on all lines are counted multiple times for each line. Excludes light rail line T2.
There are 263 stations if the 42 (36 2-line, 6 3-line) interchange stations (i.e. different sets of platforms) are counted as one station. There are 312 stations if all stations on all lines are counted multiple times for each line.
First line of Foshan Metro, the Guangfo Line, serves two cities – Foshan and Guangzhou. The Guangfo Line is operated by Guangzhou Metro and as such is included in Guangzhou's tally.
There are 102 stations if the (14 2-line, 1 3-line) interchange stations (i.e. different sets of platforms) are counted as one station. There are 118 stations if all stations on all lines are counted multiple times for each line.
There are 317 stations if the 76 (58 2-line, 8 3-line, 1 4-line) interchange stations (i.e. different sets of platforms) are counted as one station. There are 397 stations if all stations on all lines are counted multiple times for each line.
There are 254 stations if the 44 (40 2-line, 4 3-line) interchange stations (i.e. different sets of platforms) are counted as one station. There are 302 stations if all stations on all lines are counted multiple times for each line.
The first MTR route to offer metro service was the Modified Initial System in 1979, which consists of portions of the later Tsuen Wan Line and Kwun Tong Line. Though the eventual East Rail Line opened as a conventional railway in 1910, it did not offer metro service until at least in 1982 when it was electrified.
As of November2025,[update] the number of stations is 515 if the 83 interchange stations (i.e. different sets of platforms) (70 2-line, 11 3-line, and 2 4-line) are counted multiple times, once for each line, while there are 415 stations if they are combined; shared tracks/platforms on Lines 3 and 4 are anyway counted as a single stations (nine in all between Hongqiao Road and Baoshan Road). Out-of-station interchange stations with same name (e.g. South Pudong Road), are counted as one station.[132]
As of 28 December 2025, there are 441 stations if the 79 interchange stations (i.e. different sets of platforms) are counted multiple times, while there are 332 stations if they are counted as one station.
There are 265 stations if the 35 (32 2-line, 3 3-line) interchange stations (i.e. different sets of platforms) are counted as one station. There are 303 stations if all stations on all lines are counted multiple times for each line.
The number is 243 if interchange stations (i.e. different sets of platforms) are counted as one station, or 284 if all stations on all lines are counted multiple times for each line.
There are 233 stations if interchange stations (i.e. different sets of platforms) are counted as one station. There are 284 stations if all stations on all lines are counted multiple times for each line.
The number is 321 if stations are counted individually. If transfers are counted by just adding up the number of stops in each line, the number is 405.
The Green Line (Line 1), operated until 2011 by Athens–Piraeus Electric Railways, was opened in 1869 as a steam train railway line. It was electrified in 1904, extended with underground sections through the city in 1948, and extended to its full length to Kifissia in 1957 using the right-of-way of a former metre gauge suburban line. Full metro operation since 1904 between Piraeus and Athens and 1957 to Kifissia. In 2011, it was integrated with Athens Metro under the company STASY S.A.[198]
The network consists of 272 stations if transfer stations are counted more than once. If transfer stations are counted only once, the result will be 244 stations. Ashok Park Main station, where the two diverging branches of Green Line share tracks/platforms, is anyway counted as a single station. Stations of Noida Metro and Gurgaon Metro are not counted. If they were counted, then there would be 304 total stations.[222][223]
The lengths of the Noida Metro and Gurgaon Metro are not counted with the Delhi Metro. If they were counted, the total length of the three systems would be 415.48km (258.17mi).
The 43km (27mi) Line 1 of Karaj Metro (part of line 5 of Tehran metro) is a commuter rail line, and so is not included in the statistics here. If Line 1 is included, there would be 11 stations.
There are 132 stations if interchange stations are counted once, and 147 stations if they are counted multiple times. The 67.5km (41.9mi) Line 5 of the Tehran Metro is a commuter rail line, and so is not included in the statistics here – only metro Lines 1–4 and 6–7 are. If Line 5 is included, the total length of the system would be 292.1km (181.5mi), and there would be 143 unique stations, and 160 total stations.
As of July2023,[update] the number is 134 if the 9 interchange stations (i.e. different sets of platforms) are counted multiple times, once for each line, while it is 113 if they are combined.[284][285]
As of October2018,[update] the number is 106 if the 7 interchange stations (i.e. different sets of platforms) are counted multiple times, once for each line, while it is 99 if they are combined; Higashi-nihombashi station and Bakuro-yokoyama station, where an out-of-system transfer between Asakusa Line and Shinjuku Line is possible, are anyway counted as two stations.[307][308][309]
The Seoul Subway Lines 1–9 and Seoul Light Rapid Transit is actually operated by several different operators – Seoul Metro and Seoul Metro Line 9 Corporation (SLM9), plus through-operation services from Korail – but because all of these lines are owned by the City Government of Seoul, here in the table they are counted together as one system.
Seoul's Metropolitan Subway system can also be viewed as a comprehensive metro network made up of multiple owned/operated metro systems. If viewed as such, the combined route length of Seoul's comprehensive metro-standards network would be 564.2km (350.6mi), with 656 stations of 24 lines.
The number is 138 if interchange stations (i.e. different sets of platforms) are counted as one, or 149 if stations are counted multiple times for each line.
The number is 163 if interchange stations (i.e. different sets of platforms) are counted as one, or 195 if stations are counted multiple times for each line.[335]
Some sections of the Rotterdam Metro (portions of Lines A, B, E) have some level crossings (with priority) and so could therefore be considered "light rail" instead of "metro".
These systems have similarities to light rail systems, because of the existence of a few road level crossings, but are listed since they are almost entirely separated from roads.
The first underground portion was opened in 1928, but that was a tram line. One surface line has origins from 1898. System opened as a full Metro in 1966.
The number of stations is 249 if interchange stations (i.e. different sets of platforms in a single complex) are counted as one station, or 306 if all stations on all lines are counted each.
The number of stations is 13 if interchange stations (i.e. different sets of platforms in a single complex) are counted as one station, or 14 if all stations on all lines are counted each.
The number is 66 if interchange stations (i.e. different sets of platforms) are counted as one station, or 75 if all stations on all lines are counted multiple times for each line.
TMB-operated lines L1–L5 and L9–L11 only. FGC-operated lines L6-L8 share track with other FGC commuter lines, and thus do not qualify as metro-standards lines.
The first line, later known as Green Line, was opened by stages during the 1950s, partly converting to metro operations prior rapid tram alignments. These included the oldest tunnel, built in 1933, which name (Tunnelbana) and symbol were bequeathed to the new system.
As of January2020,[update] the number is 131 if the 12 interchange stations (i.e. different sets of platforms) are counted multiple times, once for each line, while it's 119 if they are combined. Out-of-station transfers at Banqiao and Xinpu – Xinpu Minsheng, which require leaving paid area, are counted as 2 stations each; transfer stations that provide cross-platform interchange are anyway counted as a single stations (four in all: Ximen, CKS Memorial Hall, Guting and Dongmen stations).[392][393]
As of October2025,[update] the number is 160 if the 12 interchange stations (i.e. different sets of platforms) are counted multiple times, once for each line, while it is 148 if they are combined.[409][410]
The number of stations is 27 if interchange stations (i.e. different sets of platforms in a single complex) are counted as one station, or 30 if all stations on all lines are counted each.
The number of stations is 49 if interchange stations (i.e. different sets of platforms in a single complex) are counted as one station, or 52 if all stations on all lines are counted each.
London's Metropolitan Railway first opened for service in 1863, operating steam locomotive trains in cut and cover tunnels. It began operating as a modern metro when electric-propulsion trains began operating on the system's first deep-level tube line in 1890.[2]
The originally-elevated Orange Line opened in 1901, sharing the Tremont Street Subway that had opened in 1897 as an underground streetcar tunnel (for the light railGreen Line).
This figure comes from the sum of the following figures from the accompanying reference (i.e. "Facts at a Glance". Chicago Transit Authority. December 2012. Retrieved 21 July 2013.): 35.8 miles of elevated route, 35.0 miles at grade level, 20.6 miles on embankments, and 11.4 miles of subway.
First regular elevated railway service, originally cable hauled, began in 1868. Elevateds converted to steam power in 1870, electrified by 1903. The first section of electrified subway opened in 1904.
The number is 423 if station complexes (with multiple sets of platforms connected by walkways) are counted as one station, or 472 if all stations on all lines are counted multiple times for each line.[437]
The last completely new stations were the current Newark and Harrison stations, which respectively replaced the Park Place and Harrison stations on a different alignment in 1937. According to PATH, its newest station is World Trade Center, which was completed in 2015 but replaced a previous station on the same site.
Opening of the Bridge Line, the precursor rapid transit line to PATCO's, which ran between 8th Street in Philadelphia and Broadway in Camden. The current PATCO Speedline, with service through to Lindenwold, opened in 1969.[450]
This figure excludes the eBART extension from Pittsburg/Bay Point to Antioch (9.2 miles) and the "BART to Oakland International Airport (OAK) elevated guideway" (3.2 miles).
The number of stations is 45 if interchange stations (i.e. different sets of platforms in a single complex) are counted as one station, or 50 if all stations on all lines are counted each.
By the end of 2014, Caracas Metro had a length of 54.03 km and 47 stations;[456] further 1.3 km was added with the single-station extension to Bello Monte in the following year.[457]Los Teques Metro contributes to the system's total with 11.9 km in length and four stations.[458]
This patronage figure is derived from OPAL trips (i.e. a tap-on/tap-off pair of the same OPAL card, including isolated tap-on or tap-off), non-OPAL ridership, as the users of some concessional cards or integrated tickets for events, is excluded.
All American Public Transportation Association figures are derived from unlinked transit passenger trips (i.e. a transfer between two lines counts as two passenger trips, transferring twice counts as three trips, etc.).
This ridership figure is the sum of the two "Μετρό" figures (Γ1 line, or "Ηλεκτρικός", formerly ran by IASA and Γ2–Γ3 lines, formerly ran by AMEL) from the OAΣA's 2024 Activity Report.
Figure extrapolated from a sum of average daily ridership figures of lines 1 (3,54,610), 2A & 7 (1,80,726.37) over an year as mentioned in the cited reports
Compared to European or North American systems, Japanese rapid transit systems are generally neither thought of as metros nor as completely subterranean "subways" complicating whether only using the municipal subway statistic is accurate when comparing with other Metros around the world. As example Tokyo Metro and the Tokyo Metropolitan Bureau of Transportation's Toei Subway constitute only 22% of the 14.6 billion metropolitan railway ridership in Greater Tokyo (MLIT Yearly Statistics). In addition, when one considers intracity lines of JR East and private railway companies, Greater Tokyo (130 lines) has higher daily ridership than any other metropolitan area in the world with 14.6 billion passengers annually. The Osaka Municipal Subway also has only a minority share of all metropolitan railway ridership in Greater Osaka, constituting only 17.6% of Greater Osaka's 4.745 billion rail passengers annually in 2010. Including the municipal subway systems in both Kobe and Kyoto, the result still only comprises 22% of all rail travel in the Greater Osaka area with 1065.8 million passengers yearly (MLIT Yearly Statistics). For Greater Nagoya, the Nagoya Municipal Subway has only a minority share of all metropolitan railway ridership in Greater Nagoya constituting only 38% of Greater Nagoya's 1.095 billion rail passengers annually in 2010 (MLIT Yearly Statistics). For a complete list of urban rail systems in Japan with ridership statistics, see List of urban rail systems in Japan.
This figure counts only gate-passers, so it only includes Seoul Metro and Seoul Subway Line 9 riders. Other lines that function as separate systems within the greater Seoul urban rail network are excluded.
Ridership is based on unlinked passenger trips (i.e. a transfer between two lines counts as two trips, transferring between three lines counts as three trips, etc.).
This ridership figure is the sum of the total annual trips (수송인원, boarding and transfer passengers) on the two sections (Phase 1 and Phase 2) of the line, from the accompanying reference.
This figure is the sum of the passenger ridership on the two LRTA lines, L1 and L2, from the accompanying reference; it is based on unlinked passenger trips (i.e. a transfer between two lines counts as two trips, etc.).
Barreiro, Ricardo (2015). 100 años bajo Buenos Aires – Historia de la Línea A[100 years under Buenos Aires – History of Line A] (in Spanish). Editorial Dunken. pp.16, 30–31. ISBN978-987-02-8141-2.
As for the size the system reached by the end of 2017, see "40 Jahre U–Bahn: Eine Wiener Verkehrsrevolution"[40 years of UBahn: a Viennese transport revolution]. Die Presse (in German). "Die Presse" Verlags-Gesellschaft m.b.H. Co KG. 25 February 2018. slide 16. Retrieved 17 September 2018.
As for the station opened after the end of 2017, see Perazzolo, Anna; Mayr, Christian (18 January 2026). "Geisterstationen und Geheimtunnel: Die dunkle Welt der Wiener U-Bahn"[Ghost stations and secret tunnels: The dark world of the Vienna U-Bahn]. Kurier (in German). Kurier-Zeitungsverlag und Druckerei GmbH. Retrieved 19 January 2026.
История развития метрополитена[History of the metro]. Государственное предприятие "Минский Метрополитен" [State Enterprise "Minsk Metro"]. Archived from the original on 30 June 2015. Retrieved 9 December 2020.
Метро сегодня[Metro today] (in Russian). Государственное предприятие "Минский Метрополитен" [State Enterprise "Minsk Metro"]. Archived from the original on 30 June 2015. Retrieved 8 December 2020.
"Sobre o metro – Memória" (in Portuguese). Companhia do Metropolitano do Distrito Federal – Metrô. 2013. Archived from the original on 25 September 2013. Retrieved 16 September 2013.
Germano Bastos Lopes, Camilla (7 January 2020). "Em fase de testes, nova estação do metrô é aberta"[In testing phase, new metro station is opened]. Jornal de Brasília (in Brazilian Portuguese). Retrieved 1 March 2020.
As for the station opened after the end of 2019, see "Estação Estrada Parque começa a funcionar na segunda-feira"[Estrada Parque station starts operating on Monday]. Correio Braziliense (in Brazilian Portuguese). Diários Associados. 3 January 2020. Retrieved 1 March 2020.
"Sobre o metro – Estrutura" (in Portuguese). Companhia do Metropolitano do Distrito Federal – Metrô. 2013. Archived from the original on 20 November 2012. Retrieved 16 September 2013.
"Inauguração do Metrofor"[Metrofor Inauguration]. www.ceara.gov.br (in Portuguese). State government of Ceará. 16 June 2012. Retrieved 26 February 2023.
"História"[History]. www.trensurb.gov.br (in Portuguese). Empresa de Trens Urbanos de Porto Alegre S.A. – TRENSURB. Archived from the original on 7 July 2016. Retrieved 8 December 2017.
"Estações e sistema"[Stations and network]. www.trensurb.gov.br (in Portuguese). Empresa de Trens Urbanos de Porto Alegre S.A. – TRENSURB. Archived from the original on 13 November 2017. Retrieved 8 December 2017.
Rodrigues, Matheus; Silveira, Daniel (30 July 2016). "Com Temer e Pezão, Linha 4 do Metrô no Rio é inaugurada"[With Temer and Pezão, Line 4 of the Metro in Rio is inaugurated]. Rio de Janeiro. G1 (in Portuguese). Grupo Globo. Retrieved 30 July 2016.
"Quem somos"[About us] (in Portuguese). Companhia do Metropolitano de São Paulo - Metrô. 2017. Archived from the original on 27 April 2018. Retrieved 27 November 2017.
"2017 – Operating Statistics". Toronto Transit Commission (TTC). 2018. Section Two› Official Opening Date. Archived from the original on 28 January 2020. Retrieved 16 September 2018.
"2017 – Operating Statistics". Toronto Transit Commission (TTC). 2018. Section One› System Quick Facts. Archived from the original on 28 January 2020. Retrieved 16 September 2018.
"杭州地铁7号线和9号线全线贯通-杭州新闻中心-杭州网"[Hangzhou Metro Line 7 and Line 9 are fully connected]. hznews.hangzhou.com.cn (in Chinese). Hangzhou News Center. Retrieved 2 April 2022.
"泉城"济南迈进地铁时代["Spring city" Jinan is entering the subway era] (in Chinese). Xinhua News Agency. 1 January 2019. Archived from the original on 2 January 2019. Retrieved 1 January 2019.
官宣！洛阳地铁1号线3月28日开通 中西部非省会城市第一个[Official announcement! Luoyang Metro Line 1 opens on 28 March, the first non-capital city in Midwestern China]. Luoyang Daily (in Chinese). 26 March 2021. Archived from the original on 27 March 2021. Retrieved 4 April 2021.
"Macao Light Rapid Transit Corporation Limited". Macao Light Rapid Transit Corporation Limited (in Chinese (Macau) and European Portuguese). Sociedade do Metro Ligeiro de Macau, S.A. 15 March 2024. Retrieved 10 March 2025.
"14号线、18号线一期北段12月30日起开通初期运营 申城轨道交通网831公里、5条全自动线 规模世界第一"[Shanghai Metro Line 14 & Line 18 Phrase I north part to enter service on 30 December with the network extends to 831 kilometers and five GoA4 lines as the world's largest metro system]. shmetro.com (in Chinese). 28 December 2021. Archived from the original on 30 December 2021. Retrieved 28 December 2021.
无锡地铁7月1日开通 全长29.42公里[Wuxi Metro with a total length of 29.42km opening 1 July] (in Chinese). Jiangsu Real Estate Association. 27 June 2014. Archived from the original on 14 July 2014. Retrieved 2 July 2014.
"Sporplan"[Track plan] (in Danish and English). Metroselskabet. 22 November 2006. Archived from the original(PDF) on 22 October 2013. Retrieved 9 April 2014.
Valenzuela, Ana Carolina Cueva (24 February 2026). "Todo lo que debes saber del metro hacia Los Alcarrizos"[Everything you need to know about the metro to Los Alcarrizos] (in Spanish). Diario Libre. Retrieved 25 February 2026.
As for the size the system reached by the end of 2017, see "The Metro: a Parisian institution". RATP. Archived from the original on 18 February 2017. Retrieved 11 September 2018. The Montmartre funicular is considered to be part of the metro system, within which is represented by a 303rd fictive station "Funiculaire".
Groneck, Christoph (20 May 2020). U-Bahn, S-Bahn & Tram in Paris – Urban Rail in the French Capital. Robert Schwandl Verlag. p.8. ISBN978-3-936573-62-6.
As for the size the system reached by the end of 2009, see Schwandl, Robert (2 July 2014). U-Bahn, S-Bahn & Tram in Berlin (2nded.). Schwandl. p.8. ISBN978-3-936573-43-5.
As for the section opened after the end of 2009, see Fender, Keith (4 December 2020). "Berlin U5 extension opens". International Railway Journal. Simmons-Boardman Publishing Inc. Retrieved 8 December 2020.
"Historie der Hochbahn"[History of the U-Bahn] (in German). Hamburger Hochbahn AG. 2013. Archived from the original on 21 October 2013. Retrieved 30 September 2013.
"Die Hochbahn auf einen Blick"[The Hochbahn at glance] (in German). Hamburger Hochbahn AG. 1 May 2020. Archived from the original on 3 June 2021. Retrieved 17 February 2021.
"MVG in figures"(PDF). Münchner Verkehrsgesellschaft mbH (MVG) Marketing. June 2013. Archived from the original(PDF) on 4 October 2013. Retrieved 2 October 2013.
Lankes, Matthias; Seitzinger, Elisabeth (15 October 2020). "Großreuth bei Schweinau"(PDF). U-Bahn Nürnberg Heft[Nuremberg U-Bahn booklet]. No.19. Stadt Nürnberg / Planungs- und Baureferat [City of Nuremberg / Planning and Construction Department]. Retrieved 18 October 2020.
"Historical Data". STASY S.A. 1 August 2013. Retrieved 21 August 2013. The Athens Metro incorporates the steam-powered Athens–Piraeus Railway (SAP, now Line 1), which opened on 27 February 1869. The railway's first tunnel section, between Monastiraki and Omonoia, opened on 17 May 1895, and SAP completed the electrification of the line on 16 September 1904.
Joel Joseph (25 April 2017). "Two more Rapid Metro stations open today". The Times of India. Gurugram: The Times Group - Bennett, Coleman & Co. Ltd. Retrieved 4 December 2017.
"Your Metro – Features". www.reliancemumbaimetro.com. Mumbai Metro One Private Ltd. Archived from the original on 26 September 2020. Retrieved 20 September 2020.
"Parte la metro! 2 marzo 2013"[The Metro is coming!] (in Italian). Brescia Mobilità. 2 March 2013. Archived from the original on 12 October 2013. Retrieved 11 October 2013.
地下鉄の概要[Overview of the subway] (in Japanese). 大阪市営交通局 [Osaka Municipal Transportation Bureau]. Archived from the original on 11 January 2014. Retrieved 25 October 2018.
営業線の概要[Overview of operating lines] (in Japanese). 大阪市営交通局 [Osaka Municipal Transportation Bureau]. Archived from the original on 11 January 2014. Retrieved 7 June 2014.
"各駅乗降人員一覧"[List of passenger numbers at each station] (in Japanese). Tokyo Metropolitan Government Bureau of Transportation. Retrieved 18 January 2026. Annual ridership figure is calculated from the 90024 passenger daily average quoted.
日比谷線新駅の名称を「虎ノ門ヒルズ駅」に決定しました！[The name for the Hibiya Line new station has been finalised to be "Toranomon Hills Station"!](PDF). Tokyo Metro. 5 December 2018.
Transit Planning – Urban Rail Department (27 October 2023). "서울지하철 현황 및 이용안내". news.seoul.go.kr. Seoul Metropolitan Government. Retrieved 15 January 2024.
"Longitud de las Líneas (KM.)"[Length of the Lines (km)] (in Spanish). Metro de la Ciudad de Mexico. Archived from the original on 22 March 2019. Retrieved 22 March 2019.
"Årsrapport 2016"[Annual Report 2016](PDF) (in Norwegian). Ruter As. 2016. p.23. Archived from the original(PDF) on 14 December 2017. Retrieved 14 December 2017.
Метрополитены России за 6 месяцев 2015 год[Metros of Russia after 6 months of 2015]. www.nsk-metro.ru (in Russian). Новосибирский метрополитен [Novosibirsk metro]. Retrieved 7 June 2018.
As for the size the system reached by the end of 2018, see "Basic data 2019"(PDF). Transports Metropolitans de Barcelona (TMB). Retrieved 10 March 2019. The Montjuïc Funicular, despite being considered to be part of the metro system, is excluded.
As for the size the system reached by the end of 2017, see "Annual report 2017"(PDF). CRTM – Consorcio Regional de Transportes de Madrid. 2019. p.29. Archived from the original(PDF) on 27 July 2020. Retrieved 25 April 2020.
Smith, Glenn (20 April 2012). "Taiwan: transit in transition". International Railway Journal. Simmons-Boardman Publishing Inc. Archived from the original on 10 September 2014. Retrieved 11 January 2015.
"Bursaray Teknık Özellıkler"[Bursaray Technical Specifications] (in Turkish). Burulaş Bursa Ulaşım Toplu Taşım İşletmeciliği Turizm San. Ve Tic. A.Ş. [Burulaş Bursa Transportation Mass Transit Administration Tourism Industry. Ve Tic. Inc.] Archived from the original on 6 June 2014. Retrieved 3 June 2014.
"What we do". Transport for London. Archived from the original on 24 May 2022. Retrieved 24 May 2022. London Underground, better known as the Tube, has 11 lines covering 402km and serving 272 stations.
Barrow, Keith (9 November 2015). "Caracas opens metro Line 5". International Railway Journal. Simmons-Boardman Publishing Inc. Retrieved 24 December 2019.
"RELATÓRIO DE GESTÃO 2019"[2019 Management Report](PDF) (in Portuguese). Companhia Brasileira de Trens Urbanos (CBTU). 31 December 2019. p.39. Archived from the original(PDF) on 2 February 2022. Retrieved 1 February 2022.
"Relatório Integrado 2022"[Integrated Report 2022](PDF) (in Portuguese). Empresa de Trens Urbanos de Porto Alegre S.A. – TRENSURB. 31 May 2023. p.26. Archived from the original(PDF) on 30 June 2023. Retrieved 1 July 2023.
"城市轨道交通2024年度统计和分析报告"[Urban Rail Transit Statistics and Analytics Report 2024]. 中国城市轨道交通协会 (in Chinese). Archived(PDF) from the original on 29 March 2024. Retrieved 29 March 2024.
"城市轨道交通2023年度统计和分析报告"[Urban Rail Transit Statistics and Analytics Report 2023](PDF). 中国城市轨道交通协会 (in Chinese). Archived(PDF) from the original on 29 March 2024. Retrieved 29 March 2024.
"Rapporto di sostenibilità 2024"(PDF). www.gtt.to.it. Gruppo Torinese Trasporti S.p.A. Archived(PDF) from the original on 16 September 2025. Retrieved 15 November 2025.
令和7年度 地下鉄事業の現況[FY2025 Current status of subway business](PDF). Chikatetsu Jigyo No Genkyo (in Japanese). 一般社団法人 日本地下鉄協会 [Japan Subway Association]. ISSN2188-0786. Retrieved 18 January 2026.
"令和6年度決算の概要"[Summary of FY2024 financial results](PDF). www.twr.co.jp (in Japanese). Tokyo Waterfront Area Rapid Transit .Inc. 5 June 2025. p.1. Retrieved 18 January 2026.
Annual ridership figure is calculated from the 225431 passenger daily average quoted.
2019 Statistical Yearbook of Railroad (Report) (in Korean). Vol.II 지역간철도 [Urban railway] (57ed.). Korea Railroad corp. (KORAIL). 31 August 2020. pp.534–535. Archived from the original(PDF) on 30 October 2021. Retrieved 1 September 2020.
"Prasarana's Ridership". Prasarana Malaysia Berhad. Archived from the original on 1 February 2024. Retrieved 2 February 2024.
This ridership figure is the sum of those quoted for the rapid transit lines
"2019 Annual Report"(PDF). www.lrta.gov.ph. Light Rail Transit Authority (LRTA). August 2020. p.43. Archived from the original(PDF) on 3 February 2021. Retrieved 19 December 2020.
"Passenger Traffic of Taichung Metro". MOTC Transportation Statistics Data Query. 交通部 – Ministry of Transportation and Communications (MOTC). 26 January 2026. Retrieved 15 February 2026.
Yilmaz, Murat (7 January 2024). "2023'te toplu taşıma"[Public transport in 2023]. Ankara Haberleri [Ankara News]. Hürriyet (in Turkish). Demirören Group. Retrieved 12 February 2024.
Кількість перевезених пасажирів за видами транспорту[Number of passengers carried by transport mode](PDF). www.dneprstat.gov.ua (in Ukrainian). Державна служба статистики України [State statistic service of Ukraine]. 2021. Retrieved 14 September 2021.
Кількість перевезених пасажирів за видами транспорту[Number of passengers carried by transport mode]. kh.ukrstat.gov.ua (in Ukrainian). Державна служба статистики України [State statistic service of Ukraine]. Archived from the original on 4 April 2020. Retrieved 14 September 2021. (You can select English from the language dropdown)
Кількість перевезених пасажирів за видами транспорту[Number of passengers carried by transport mode]. kyiv.ukrstat.gov.ua (in Ukrainian). Державна служба статистики України [State statistic service of Ukraine]. Retrieved 14 September 2021.
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