List Of Rapid Transit Systems

For light metro systems, see Medium-capacity rail system § List of systems.
See also: List of suburban and commuter rail systems, List of tram and light rail transit systems, and List of bus operating companies
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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-Bahn* or *undergrounds*. Template:As of, 182 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 New York City Subway has the greatest number of stations. The country with the most metro systems is China, with 40 in operation. The Shanghai Metro has the world's largest metro network.

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## 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". The terms heavy rail (mainly in North America) and heavy urban rail are essentially synonymous with the term "metro". Heavy rail systems are also specifically defined as an "electric railway".

The dividing line between metro and other modes of public transport, such as light rail and commuter rail, is not always clear, and while UITP only makes distinctions between "metros" and "light rail", the American Public Transportation Association (APTA) and Federal Transit Administration (FTA) distinguish all three modes. A common way to distinguish metro from light rail is by their separation from other traffic. While light rail systems may share roads or have level crossings, a metro system runs, almost always, on a grade-separated exclusive right-of-way, with no access for pedestrians and other traffic. And 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. Furthermore, most metro systems do not share tracks with freight trains or inter-city rail services. It is however 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 of 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.

## Legend

 File:World metro system cities.png
 File:World Metro systems.svg
City
Primary city served by the metro system.
Country
Sovereign state in which the metro system is located.
Name
The most common English name of the metro system (including a link to the article for that system).
Year opened
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.
## List

Template:Compact ToC

Template:Selfref-inline

Table notes
Template:Note Indicates ridership figures based on the fiscal year rather than the calendar year.

## Under construction

The following is a list of new worldwide metro systems that are currently actively under construction. Note that 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 is no metro systems currently in operation in the same city.

The countries of Bangladesh, Ecuador, Estonia, Ireland, Israel, Ivory Coast, Kuwait, Latvia, Lithuania, New Zealand, Nigeria, South Africa and Vietnam are currently constructing their first ever metro systems.

1. ↑ World Metro Figures 2018 – Statistic Brief. Union Internationale des Transports Publics (UITP) (International Association of Public Transport) (September 2018).
2. ↑ 2.0 2.1 2.2 A brief history of the Underground – London Underground milestones. Transport for London.
3. ↑ The Metro: an opportunity for sustainable development in large cities. Union Internationale des Transports Publics (UITP) (International Association of Public Transport) (November 2003).
4. ↑ What is the largest metro system in the world? (5 September 2015).
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30. ↑ Activity Report 2011 – Figures & statistics '11. STIB/MIVB.
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238. ↑ 238.0 238.1 238.2 238.3 Fukuoka Municipal Subway. 一般社団法人 日本地下鉄協会 [Japan Subway Association] (17 June 2018).
239. ↑ 239.00 239.01 239.02 239.03 239.04 239.05 239.06 239.07 239.08 239.09 239.10 239.11 239.12 Subways in Japan. 一般社団法人 日本地下鉄協会 [Japan Subway Association] (2017).
240. ↑ Template:Cite news
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244. ↑ Error on call to Template:cite web: Parameters **url** and **title** must be specified (ja). 一般社団法人 日本地下鉄協会 [Japan Subway Association] (2016).
245. ↑ Error on call to Template:cite web: Parameters **url** and **title** must be specified (ja). 大阪市営交通局 [Osaka Municipal Transportation Bureau].
246. ↑ Your Transportation / Subway. Hokkaido University (1 September 2017).
247. ↑ 247.0 247.1 247.2 Error on call to Template:cite web: Parameters **url** and **title** must be specified (ja). 一般社団法人 日本地下鉄協会 [Japan Subway Association] (2017).
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254. ↑ 254.0 254.1 254.2 254.3 Yokohama Municipal Subway. 一般社団法人 日本地下鉄協会 [Japan Subway Association].
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256. ↑ 256.0 256.1 Overview > Company Information > Operation System. Daegu Metropolitan Transit Corporation.
257. ↑ Error on call to Template:cite web: Parameters **url** and **title** must be specifiedLee, In-kyung (14 December 2020). (ko). Rail News Corp..
258. ↑ 258.0 258.1 As for the Line 2, whose current length has been reached by the end of 2018, see General information. Incheon Transit Corporation.
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267. ↑ Longitud de las Líneas (KM.) (es). Metro de la Ciudad de Mexico.
268. ↑ Sistema de Transporte Colectivo › Metrorrey › Historia (es-MX). Gobierno del Estado de Nuevo León, México.
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275. ↑ Rivera, Lourdes. Presidente Varela entrega la Línea 2 del Metro de Panamá, obra construida con "transparencia y eficiencia" – El Metro de Panamá (es).
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285. ↑ Metrorex history. Metrorex.
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287. ↑ Metrorex – Network features. Metrorex.
288. ↑ Metroelektrotrans (ru).
289. ↑ Schwandl, Robert. Kazan.
290. ↑ 290.0 290.1 290.2 290.3 290.4 290.5 290.6 290.7 Error on call to Template:cite web: Parameters **url** and **title** must be specified (ru). Новосибирский метрополитен [Novosibirsk metro].
291. ↑ Error on call to Template:cite web: Parameters **url** and **title** must be specified (ru). Moskovsky Metropoliten.
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298. ↑ Template:Cite news
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303. ↑ L'estació de Zona Franca de la línia 10 Sud de metro obrirà les portes dissabte a les 3 de la tarda. Transports Metropolitans de Barcelona (TMB) (30 January 2020).
304. ↑ 304.0 304.1 As for the size the system reached by the end of 2018, see Basic data 2019 (pdf). Transports Metropolitans de Barcelona (TMB). The Montjuïc Funicular, despite being considered to be part of the metro system, is excluded.
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311. ↑ 311.0 311.1 As for the size the system reached by the end of 2017, see Annual report 2017. CRTM – Consorcio Regional de Transportes de Madrid (2019).
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322. ↑ Company's Profile. Bangkok Mass Transit System Public Company Limited.
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328. ↑ 328.0 328.1 Ankara's newest metro line expected to serve 50,000 a day.
329. ↑ 329.0 329.1 GENERAL DIRECTORATE of EGO – THE SUBWAY SYSTEMS – OPERATED RAIL SYSTEM LINES. General Directorate of EGO (29 August 2012). Simply sum the lengths and number of stations on the operational lines to obtain the totals for the Ankara Metro.
330. ↑ 330.0 330.1 BURSARAY TEKNİK ÖZELLİKLER (tr). Burulaş Bursa Ulaşım Toplu Taşım İşletmeciliği Turizm San. Ve Tic. A.Ş. [Burulaş Bursa Transportation Mass Transit Administration Tourism Industry. Ve Tic. Inc.].
331. ↑ Timeline. Metro İstanbul A.Ş..
332. ↑ İstanbul'a Yeni Metro Hattı.
333. ↑ As for the size the system reached by the end of 2019, see 2019 Faaliyet Raporu (tr). Metro İstanbul A.Ş..
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334. ↑ 334.0 334.1 334.2 334.3 Metro Bayrami (tr). İzmir Metrosu A.Ş. (31 July 2014).
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336. ↑ Middle East › Light Rail and Metro. Serco Group plc (13 January 2017).
337. ↑ Photos: Dubai Investment Park, Expo Stations on Dubai Metro Route 2020 are now open (en).
338. ↑ 338.0 338.1 338.2 Glasgow Subway – SPT – Corporate Information. Strathclyde Partnership for Transport (SPT) (2013).
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341. ↑ 341.0 341.1 341.2 About TfL – What we do – Docklands Light Railway. Transport for London.
342. ↑ 342.0 342.1 MARTA's Past and Future. Metropolitan Atlanta Rapid Transit Authority (MARTA).
343. ↑ 343.0 343.1 Department of Finance (22 December 2017). Hutchinson, Gordon (CFO):Comprehensive Annual Financial Report for the fiscal year ended June 30, 2017. Metropolitan Atlanta Rapid Transit Authority (MARTA).
344. ↑ 344.0 344.1 344.2 344.3 344.4 344.5 2016 Public Transportation Fact Book - Appendix A: Historical Tables (pdf). APTA (American Public Transportation Association) (February 2017).
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353. ↑ 353.0 353.1 2013 Annual Report – RTA Facts. Greater Cleveland Regional Transit Authority (31 October 2013).
354. ↑ History – PATH – The Port Authority of NY & NJ (2013).
355. ↑ Maps & Schedules – PATH – The Port Authority of NY & NJ (2013).
356. ↑ Facts & Info – PATH – The Port Authority of NY & NJ (2013).
357. ↑ 357.0 357.1 357.2 357.3 Facts at a Glance. Los Angeles County Metropolitan Transportation Authority (LACMTA).
358. ↑ Miami-Dade County – Miami-Dade Transit – Miami-Dade Transit History. Miami-Dade County (9 July 2013).
359. ↑ 359.0 359.1 Miami-Dade County – Miami-Dade Transit – Metrorail. Miami-Dade County (9 July 2013).
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363. ↑ MTA | news | Staten Island Railway Celebrates 1st New Station in 20 Years.
364. ↑ MTA New York City Transit – Staten Island Railway Map.
365. ↑ 365.0 365.1 SEPTA Operating Facts Fiscal Year 2013 4–6. SEPTA (30 June 2013).
366. ↑ SEPTA Route Statistics 2014 9, 13, 221. SEPTA Service Planning Department (2014).
367. ↑ SEPTA – Media Guide 7, 11. SEPTA (2013).
368. ↑ 368.0 368.1 368.2 BART – System Facts. San Francisco Bay Area Rapid Transit District.
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1. ↑ Statistiques voyageur (fr). Entreprise Métro d'Alger.
2. ↑ Por la pandemia, la cantidad de pasajeros del Subte cayó un 77% en 2020 (8 February 2021).
3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 Error on call to Template:cite web: Parameters **url** and **title** must be specified (ru). Международная Ассоциация "Метро" [International Association of Metros].
4. ↑ Public Transport Patronage. Transport for NSW (2020).
5. ↑ Facts & Figures – Operating Data 2019. Wiener Linien (June 2020).
6. ↑ Statistics 2019. STIB/MIVB.
7. ↑ RELATÓRIO DE GESTÃO 2018 (pt) 36–37. Companhia Brasileira de Trens Urbanos (CBTU) (31 December 2018).
8. ↑ CARTA ANUAL 2020 (pt). Companhia do Metropolitano do Distrito Federal — METRO-DF (27 January 2020).
9. ↑ Relatório de Gestão do Exercício de 2018 (pt). Empresa de Trens Urbanos de Porto Alegre S.A. – TRENSURB (2019).
10. ↑ This ridership figure is the *sum* of those quoted for the two metro lines:

	* as for the Linha Centro, see Demanda anual de usuários da Linha Centro STU-REC (pt). Companhia Brasileira de Trens Urbanos (CBTU).
	* as for the Linha Sul, see Demanda anual de usuários da Linha Sul STU-REC (pt). Companhia Brasileira de Trens Urbanos (CBTU).
via GOAPO (Gerência Operacional de Apoio) – Demanda de usuários transportados
11. ↑ RELATÓRIO DE AMINISTRAÇÃO 2020 (pt) (pdf). Concessão Metroviária do Rio de Janeiro S.A. (29 March 2021).
12. ↑ This annual ridership figure is the *difference* of those quoted as the system's overall ridership from the start of operations in June 2014:

	* to the end of year 2020 (327 millions), see Demonstrações Financeiras Referentes ao Exercício findo em 31 de Dezembro de 2020 e Relatório dos Auditores Independentes sobre as Demonstrações Financeiras (pt). Companhia do Metrô da Bahia (11 March 2021).
	* to the end of year 2019 (265 millions), see Demonstrações Financeiras Referentes ao Exercício findo em 31 de Dezembro de 2019 e Relatório dos Auditores Independentes sobre as Demonstrações Financeiras (pt). Companhia do Metrô da Bahia (16 March 2020).
13. ↑ Relatório Integrado 2020 (pt). Companhia do Metropolitano de São Paulo.*This ridership figure includes the ViaQuatro Line 4 and Via Mobilidade Line 5 ridership in the total.*
14. ↑ Statistical Yearbook 2019. National Statistical Institute (29 May 2020).
15. ↑ 15.00 15.01 15.02 15.03 15.04 15.05 15.06 15.07 15.08 15.09 15.10 15.11 15.12 15.13 15.14 15.15 15.16 Public Transportation Ridership Report - Fourth Quarter 2020. American Public Transportation Association (APTA) (4 March 2021).
16. ↑ Memoria Anual 2019 (es). Metro de Santiago – Empresa de Transporte de Pasajeros Metro S.A. (26 March 2020).
17. ↑ 17.00 17.01 17.02 17.03 17.04 17.05 17.06 17.07 17.08 17.09 17.10 17.11 17.12 17.13 17.14 17.15 17.16 17.17 17.18 17.19 17.20 17.21 17.22 17.23 17.24 17.25 17.26 17.27 17.28 17.29 17.30 17.31 17.32 17.33 17.34 17.35 17.36 Error on call to Template:cite web: Parameters **url** and **title** must be specified (2021-01-05).
18. ↑ Ten-Year Statistics. MTR Corporation (2020).
19. ↑ Investor's Information › Patronage Updates. MTR Corporation.
20. ↑ Boletín Técnico Encuesta de Transporte Urbano de Pasajeros (ETUP) – IV trimestre de 2020 (es). Departamento Administrativo Nacional de Estadística (DANE) (15 February 2021).
21. ↑ Výroční Zpráva 2019 (cs). Dopravní podnik hlavnívo města Prahy (DPP) (April 2020).
22. ↑ Metroens passagertal (da). Metroselskabet.
23. ↑ Informe Trimestral de Evolución de la Demanda – Octubre - Diciembre 2020 (es) 10–11. Oficina para el Reordenamiento de Transporte (OPRET) (6 January 2021).*This ridership figure is the sum of those quoted for the rapid transit lines*
24. ↑ A look at the Cairo metro system. The National.
25. ↑ HKL Annual Report 2019. Helsinki City Transport (HKL).
26. ↑ 26.0 26.1 26.2 26.3 26.4 26.5 Rapport annuel sur le parc, le trafic et les événements d'exploitation des métros et du RER (hors RFN) pour l'année 2019 (fr). STRMTG - Service Technique des Remontées Mécaniques et des Transports Guidés (21 December 2020).
27. ↑ Zahlenspiegel 2020 (de). Berliner Verkehrsbetriebe (BVG) (31 December 2019).
28. ↑ HOCHBAHN Unternehmensbericht 2019 (de) (pdf). Hamburger Hochbahn AG.
29. ↑ MVG in figures (pdf). Münchner Verkehrsgesellschaft mbH (MVG) (November 2020).
30. ↑ Verbundbericht 2019 (de) (pdf). Verkehrsverbund Großraum Nürnberg (VGN).
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32. ↑ Tables (STADAT) - Time series of annual data - Urban passenger transport (2001–2019). Központi Statisztikai Hivatal [Central Statistics Bureau] (20 April 2020).
33. ↑ Namma Metro, 14th Annual Report 2019-20. Bangalore Metro Rail Corporation Ltd. (29 October 2020).
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48. ↑ La metropolitana più affollata d'Italia, ecco la classifica con tutti i numeri delle principali città (17 October 2017).
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58. ↑ Michael Rohde. Pyongyang – metrobits.org.
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63. ↑ Afluencia de estación por línea 2019 (es). Metro CDMX.
64. ↑ Banco de Información Económica – Comunicaciones y transportes > Principales características del sistema de transporte colectivo Metrorrey > Pasajeros transportados (es). Instituto Nacional De Estadística Y Geografía (INEGI) (15 February 2021).*This ridership figure is derived from the sum of the twelve monthly subtotals for 2020*
65. ↑ Jaarverslag 2019 (nl) (pdf). GVB Holding NV.
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69. ↑ Pasajeros Transportados en la Línea 1 (es). Autoridad Autónoma del Sistema Eléctrico de Transporte.
70. ↑ 2019 Annual Report. Light Rail Transit Authority (LRTA) (August 2020).
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75. ↑ Error on call to Template:cite web: Parameters **url** and **title** must be specified (ru). Моско́вский метрополите́н.
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82. ↑ Error on call to Template:cite web: Parameters **url** and **title** must be specified (zh). Kaohsiung Rapid Transit Corp. (8 January 2020).*This ridership figure is derived from the sum of the twelve monthly subtotals for 2019*
83. ↑ Ridership Counts. Taipei Rapid Transit Corporation (16 January 2020).*This ridership figure is derived from the sum of the twelve monthly subtotals for 2019*
84. ↑ Error on call to Template:cite web: Parameters **url** and **title** must be specified (zh). Taoyuan Metro Corporation (17 January 2020).*This ridership figure is derived from the sum of the twelve monthly subtotals for 2019*
85. ↑ Across boundaries – Annual Report 2019/20. BTS Group Holdings Public Company Ltd. (19 June 2020).
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94. ↑ Error on call to Template:cite web: Parameters **url** and **title** must be specified (uk) (pdf). Державна служба статистики України [State statistic service of Ukraine].
95. ↑ Template:Cite news
96. ↑ Annual Report 2019/20. Strathclyde Partnership for Transport (SPT) (8 September 2020).
97. ↑ 97.0 97.1 Annual Report and Statement of Accounts 2019/20 73. Transport for London (August 2020).
98. ↑ Subway and bus ridership for 2019. Metropolitan Transportation Authority (MTA) (2020).
99. ↑ [1] Template:Dead link
100. ↑ [2] Template:Dead link

1. ↑ 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.
2. ↑ Line 2's loop was completed in 2009
3. ↑ Not including stations of premetro Lines T3, T4, and T7.
4. ↑ Includes METROREC's rapid transit lines *only*: Linha Centro (Center Line) and Linha Sul (South Line).
5. ↑ 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.
6. ↑ First line of Foshan Metro serves two cities – Foshan and Guangzhou
7. ↑ 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.
8. ↑ Tuen Ma Line Phase 2
9. ↑ Line S7
10. ↑ This figure excludes Maglev line and Jinshan Railway, both often included in Shanghai Metro maps but not considered part of the system.
11. ↑ Extension of Line A from Itagüí south to La Estrella.
12. ↑ Line A was extended in April 2015.
13. ↑ Line 3's first section opened in 2012 and was extended in 2014, and extended again on 15 June 2019.
14. ↑ Opening of the Länsimetro extension on 18 November 2017.
15. ↑ Opening of Toulouse Metro Line B.
16. ↑ The U3 extension from Olympia-Einkaufszentrum (OEZ) to Moosach.
17. ↑ Kaveh station opens
18. ↑ Opening of metro-standards Line 2.
19. ↑ 19.0 19.1 The Template:Cvt 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.
20. ↑ Naples Metro is made up of Line 1 and Line 6 only. Line 2 is a commuter rail line.
21. ↑ Partial opening (line 1 only) of Municipio station in June
22. ↑ 22.0 22.1 22.2 22.3 22.4 22.5 22.6 22.7 22.8 22.9 In general, the majority of urban rail service in Japanese metropolitan areas is provided by systems not included in this list. For a complete list of urban rail systems in Japan, see List of urban rail systems in Japan.
23. ↑ Yŏnggwang and Puhŭng opened in 1987
24. ↑ Line 1
25. ↑ Daegu Metro Line 3 opened in 2015.
26. ↑ Second phase of line 1
27. ↑ Line 1 fully opened
28. ↑ 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're counted together as one system.
29. ↑ 29.0 29.1 29.2 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 Template:Cvt, and it would serve a grand total of 434 stations.
30. ↑ Includes Korail portions of Seoul Subway Line 3 (Ilsan Line: 19.2 km, 10 stations) and Seoul Subway Line 4 (Gwacheon Line and Ansan Line: 40.4 km, 22 stations), and the Suin–Bundang Line (108.1 km, 63 stations in part shared with the Ansan Line).
31. ↑ Extension of both Gwacheon Line and Subway Line 4 to Namtaeryeong Station and start of the metro through-operation on April, 1.
32. ↑ Statistics presented include rapid transit lines *only*:  Ampang Line, Sri Petaling Line, Kelana Jaya Line Sungai Buloh-Kajang Line. KL Monorail, KLIA Ekspres and KLIA Transit Line are not included.
33. ↑ Only Line 3 counts as a Metro line. Line 1 is light rail, and Line 2 is a light Metro system.
34. ↑ Line 12 opened 2012.
35. ↑ Note that:

	* "Operación": route length in active revenue and non-revenue service
	* "Servicio": route length in active revenue service
	* "Vuelta": track length in active revenue service
	* "Total": all track length in active revenue, maintenance and non-revenue service
System length value derived from "RED Servicio" or net route length in active revenue service.
36. ↑ 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".
37. ↑ These systems have similarities to light rail systems, because of the existence of road level crossings, but are listed since they are almost entirely separated from roads.
38. ↑ 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.
39. ↑ Opening of the Løren station in 2016.
40. ↑ Combined lengths of the Red, Green, and Gold lines.
41. ↑ TMB-operated lines L1-L5 and L9-L11 *only*. FGC-operated lines L6-L8 share track with other FGC commuter lines, and thus don't qualify as metro-standards lines.
42. ↑ CTB-owned and "Metro Bilbao S.A."-operated line 1 and Line 2 *only*.
43. ↑ Including TFM, MetroSur and other suburban lines, but not the three Metro Ligero de Madrid lines which are light rail.
44. ↑ 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.
45. ↑ The Lausanne Metro has two lines: Line M1 is light rail, while Line M2 is rapid transit. The stats listed are for Line M2 *only*.
46. ↑ Opening of lines M2 and M3.
47. ↑ Extension to Gürsu.
48. ↑ Currently operational metro standards lines, M1–M7, *only* included. All other Istanbul lines or segments are either tram or commuter rail, or are under construction, and so are not included here.
49. ↑ 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.
50. ↑ Includes MBTA's rapid transit lines *only*: Red Line, Orange Line and Blue Line.
51. ↑ 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 rail Green Line).
52. ↑ System contains many sections with grade crossings.
53. ↑ Dated from the opening of "The Loop", when the system became unified and electrified. However, the L first was electrified in 1895, when the Metropolitan West Side Elevated opened.
54. ↑ 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).): 35.8 miles of elevated route, 35.0 miles at grade level, 20.6 miles on embankments, and 11.4 miles of subway.
55. ↑ 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.
56. ↑ 56.0 56.1 Rapid transit B and D lines only. All other L.A. Metro Rail lines are light rail, and are not included here.
57. ↑ This was the date of the last extension to the Red Line in the rapid transit portion of Los Angeles' Metro Rail.
58. ↑ 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.
59. ↑ While the line opened as a railroad in 1860, it was not until 1925 that rapid transit equipment would be operated here.
60. ↑ Includes SEPTA's rapid transit lines *only*: Broad Street Line (Orange Line), Market–Frankford Line (Blue Line) and Norristown High Speed Line.
61. ↑ BART's rapid transit lines *only*; the eBART line to Antioch and the Oakland International Airport (OAK) APM are excluded.
62. ↑ 47 rapid transit stations, plus three additional stations (two eBART and one AGT) within the system.
63. ↑ 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).
64. ↑ The Circle Line was opened in 2020
65. ↑ Statistics presented here include the Los Teques Metro which functions as effectively a subsidiary and extension of the Caracas Metro.

1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 All American Public Transportation Association (APTA) 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.).
2. ↑ This ridership figure is the *sum* of the "Heavy Rail (HR)" and "Intermediate Rail (IR)" figures for Toronto from the APTA Ridership report – in other words, this figure includes ridership on the Line 3 Scarborough (RT) line which APTA considers to be "Intermediate Rail (IR)".
3. ↑ Counted in with Guangzhou's ridership figures.
4. ↑ Note that:

	1. annual ridership is derived from the *sum* of each month's "Monthly Total" for each year;
	2. the ridership includes "Domestic Service", "Airport Express" and "Cross-boundary";
	3. "Intercity, Light Rail & Bus" and "High Speed Rail (HSR)" are excluded from the counts.
5. ↑ Figure extrapolated from 3.6 million average daily boardings
6. ↑ Does not include ridership on the RER/Transilien (1407 million in 2019) and the Tramways (340 million).
7. ↑ 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 2018 Activity Report.
8. ↑ Figure extrapolated from 50 000 average daily boardings.
9. ↑ Figure extrapolated from 42 000 average daily boardings
10. ↑ 56.4 million including 4 Funicular lines
11. ↑ 11.00 11.01 11.02 11.03 11.04 11.05 11.06 11.07 11.08 11.09 11.10 11.11 11.12 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.
12. ↑ This ridership figure includes the Busan-Gimhae Light Rail Transit ridership in the total.
13. ↑ 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.
14. ↑ 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.).
15. ↑ This ridership figure is the *sum* of the total annual trips (Template:Lang, boarding and transfer passengers) on the five lines (Gwacheon/Ansan, Bundang, Ilsan and Suin) from the accompanying reference. Overall, Korail metro/commuter lines in Seoul Metropolitan Area (SMESRS) carry 1,189 million passengers annually (2019).
16. ↑ This ridership figure is the *sum* of the total annual trips (Template:Lang, boarding and transfer passengers) on the two sections (Phase 1 and Phase 2) of the line, from the accompanying reference.
17. ↑ This figure includes in full the ridership on Amstelveen Line until March 2019, when route 51 was curtailed at Zuid Station.
18. ↑ 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.).
19. ↑ Ridership figure is for rapid transit Line M2 *only*; ridership on the light rail M1 line is excluded.
20. ↑ This ridership figure is obtained by the *average per day ridership* monthly figures from the BEM's 2020 Ridership Report.
21. ↑ This ridership figure is the *sum* of the total annual trips on the metro lines M1–M7, from the accompanying reference; it is based on unlinked passenger trips (i.e. a transfer between two lines counts as two trips, etc.).
22. ↑ Does not include ridership on the separate Docklands Light Railway (117 million), London Overground (187 million), Tramlink or National Rail systems within Greater London.
23. ↑ L.A. Metro's heavy rail lines, the Red and Purple Lines, *only*.

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