List of urban rail systems by length

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This is a list of the longest underground/surface/elevated subways, metros and rapid transit modules of the world. Metropolitan railways are urban, electric transport systems with high capacity and a high frequency of service. Metros are totally independent from other traffic, road or pedestrians.
Criteria of Urban rail system:
1.Electrified railway system
2.Operating mostly inside urban area.
3.Using tunnels, viaducts or on surface level but with physical separation from other traffic, roads or pedestrians.
4.Independent from national railways.
5.Trains are designed for carrying large amount of passengers, so there is plenty of space for standing passengers.
6.Service fequency is normally higher than every 15 minutes.

London, United Kingdom: 408 km (181 km underground) - Lines: 12 (additionally, many lines have long branches)
New York, New York, United States: 368 km (219 km underground) - Lines: 9 independent lines with multiple branches operated as 23 routes, and 3 additional shuttle services.
Madrid, Spain: 322.3 km - Lines: 12
Tokyo, Japan: 313.3 km (Tokyo Metro 192.1 km, Toei Subway 109 km, Tokyo Waterfront Area Rapid Transit 12.2 km) - Lines: 14
Moscow, Russia: 292.9 km - Lines: 12 [1]
Seoul, South Korea: 287.4 km - Lines: 10
Shanghai, People's Republic of China: 228.4 km (a half part is elevated) - Lines: 8
Paris, France: 213.5 km (196.5 km underground) - Lines: 16 (excluding CDGVAL (3.5 km), Orlyval (7.3 km), and the RER (587 km including 76.5 km underground))
Mexico City, Mexico: 201.7 km - Lines: 11
Hong Kong, People's Republic of China: 175.4 km - Lines: 10 (excluding MTR Light Rail (36.15km))
Chicago, Illinois, United States: 173.0 km (18 km underground, the most part is elevated or at grade) - Lines: 8
Washington, D.C., United States: 169.5 km - Lines: 5
Berlin, Germany: 146 km - Lines: 9
Beijing, People's Republic of China: 141.0 km - Lines: 5
Valencia, Spain: 143 km - Lines: 5
Osaka, Japan: 129.9 km - Lines: 8
Los Angeles, California, United States: 117.6 km - Lines: 5 (35 km are underground)
Guangzhou, People's Republic of China: 116.0 km - Lines: 4
Singapore, Singapore: 109.4 km - Lines: 3 (excluding LRT (28.8 km (17.9 mi))
Stockholm, Sweden: 108.0 km - Lines: 7 services (3 independent lines; 62 km underground)
São Paulo, Brazil: 105.9 km (a half part is elevated or at grade)
Santiago, Chile: 104,5 km - Lines: 5¹ (new lines & extensions under construction not included)
Saint Petersburg, Russia: 104.1 km - Lines: 4
Hamburg, Germany: 101.0 km - Lines: 3 (40 km underground)
Munich, Germany: 98.4 km - Lines: 6 (6 services on 3 individual routes with 5 branches and several interconnections)
Busan, South Korea: 89.9 km - Lines: 3
Nagoya, Aichi, Japan: 88.9 km - Lines: 5
Milan, Italy: 84.5 km (62.9 km are underground the rest elevated or at grade) - Lines: 4 (3 have long branches)
Oslo, Norway: 84.2 km - Lines: 6
Barcelona, Spain: 83.7 km - Lines: 5
Taipei, Republic of China: 79.9 km (some elevated sections) - Lines: 5 (2 lines sharing part of trails)
Atlanta, Georgia, United States: 79.2 km (14 km underground; the most part is at grade) - Lines: 4
Delhi, India: 78.4 km (less than a half part is underground) - Lines: 3
Tyne and Wear, United Kingdom: 77.7 km (most at grade) - Lines: 2
Dallas, Texas, United States: 72.4 km (most at grade, 1 subway station) - Lines : 2
Athens, Greece: 72.2 km - Lines: 3
Boston, Massachusetts, United States: 70.6 km - Lines: 4 (there are other branches for a not full metro service for totally 101.0 km)
Toronto, Canada: 70.0 km - 4 Subway Lines; 4.4 km - Scarborough RT
Montréal, Québec, Canada: 69.2 km km - Lines: 4
Vienna, Austria: 74.6 km - Lines: 5
Cairo, Egypt: 65.5 km (the most part is at grade) - Lines: 2
Denver, Colorado, United States: 63.4 km - Lines: 6
Bucharest, Romania: 62.4 km - Lines: 4
Philadelphia, Pennsylvania, United States: 62.0 km (28.6 km are underground) - Lines: 4
Ankara, Turkey: 60.6 km - Lines: 3 (More than half part is elevated or at grade, 45 km - 3 lines under construction)
St. Louis, Missouri, United States: 60.5 km (for the most part at grade) - Lines: 2
Porto, Portugal: 60.0 km - Lines: 5 (8 km are underground, the rest at grade, 7 services including 1 shuttle)
Kiev, Ukraine: 59.2 km - Lines: 3
Frankfurt am Main, Germany: 58.7 km - Lines: 7
Kuala Lumpur, Malaysia: 56.0 km (completely elevated or at grade)
Prague, Czech Republic 54.7 km - Lines: 3
Daegu, South Korea: 54.6 km - Lines: 2
Istanbul, Turkey: 53.6 km (8 km underground, 72.4 km under construction)
Tianjin, People's Republic of China: 53.2 km
Buenos Aires, Argentina: 52,3 km - Lines: 6 (new lines & extensions under construction not included)
Amsterdam, Netherlands: 51.4 km (only 3.5 km are underground, the rest at grade)
Vancouver, British Columbia, Canada: 49 km (all elevated, at grade and underground)
Sapporo, Hokkaidō, Japan: 48.0 km
Rotterdam, Netherlands: 48.0 km
Manila, Philippines: 45.6 km - Lines: 3 (one line fully elevated, two lines mostly elevated but partially underground and/or at grade)
Lille, France: 45.5 km - Lines: 2
Caracas, Venezuela: 45.0 km - Lines: 4
Köln, Germany: 44.5 km
Yokohama, Japan: 44.5 km
Bangkok, Thailand: 44.0 km (a half part is elevated or at grade)
Valparaìso, Chile: 43.0 km (only 5 km are underground. the rest at grade)
Calgary, Alberta, Canada: 42.1 km (5% at elevated and 8% underground) - Lines: 2
Pittsburgh, Pennsylvania, United States: 41.6 km-Lines: 4 (3 underground stations)
Kobe, Hyōgo, Japan: 41.5 km
Tehran, Iran: 41.0 km
Nantes, France: 40.0 km - Lines: 3
Tashkent, Uzbekistan: 39.1 km
Lisbon, Portugal : 39.0 km - Lines: 4
Bilbao, Spain: 38.2 km - Lines: 2
Rio de Janeiro, Brazil: 37.7 km (partly elevated)
Lyon, France: 37.5 km - Lines: 4
Miami, Florida, United States: 36.0 km (completely elevated)
Rome, Italy : 35.9 km (27.5 km are underground; the rest at grade)
Kharkiv, Ukraine : 35.3 km - Lines: 3
Porto Alegre, Brazil : 34.5 km (completely at grade)
Budapest, Hungary : 33.0 km
Brussels, Belgium : 32.2 km
Brasilia, Brazil : 32.0 km (the most part is at grade)
Cleveland, Ohio, United States: 31.0 km (only 1 km is underground; the rest is at grade)
Napoli, Italy : 30.5 km (4 km are elevated or at grade) - Lines: 3
Baku, Azerbaijan : 30.5 km
Minsk, Belarus : 30.3 km - Lines: 2
Belo Horizonte, Brazil : 30.0 km (completely elevate and at grade)
Fukuoka, Fukuoka, Japan : 29.8 km
Medellín, Colombia : 29.9 km (completely elevate and at grade)
Nürnberg, Germany : 29.0 km
Valencia, Spain : 29.0 km (19 km underground)
Recife, Brazil : 29.0 km (completely at grade)
Toulouse, France : 27.5 km
Kyoto, Japan : 26.4 km
Tbilisi, Georgia : 26.3 km
Baltimore, Maryland, United States: 24.5 km (a half part is elevated or at grade)
Guadalajara, Mexico : 24.0 km (partly at grade)
Monterrey, Mexico : 23.0 km (partly elevated)
Incheon, South Korea : 23.0 km
Daejeon, South Korea : 22.6 km - Lines: 1
Pyongyang, North Korea : 22.5 km - Lines: 2
Essen, Germany : 22.4 km
Shenzhen, People's Republic of China : 21.8 km
Helsinki, Finland : 21.1 km (7.1 km are underground)
Copenhagen, Denmark: 21.0 km (a half part is elevated)
Hannover, Germany : 19.5 km (plus 97 km light rail)
Marseille, France : 19.3 km
Warsaw, Poland : 18.2 km
Kryvy Rih, Ukraine : 17.7 km (underground tramway)
Dortmund, Germany : 17.5 km (plus 37.5 km light rail)
Nizhniy Novgorod, Russia : 17.5 km
Bursa, Turkey : 17.5 km
San Juan, Puerto Rico: 17.2 km (the most part is elevated or at grade)
Nanjing, China : 17.0 km (10.6 km are underground the rest at grade)
Calcutta, India : 16.5 km
Chennai/Madras, India : 16.0 km (completely elevated)
Sendai, Japan : 15.0 km
Santo Domingo Metro, Dominican Republic : 14.5 km
Novosibirsk, Russia : 14.3 km
Bochum, Germany : 14.2 km
Volgograd, Russia : 13.5 km (only 3.3 km are underground)
Yerevan, Armenia : 13.4 km
Wuppertal, Germany: 13.3 km (suspension urban rail line)
Edmonton, Canada : 13.1 km (7.6 km on the surface)
Gwangju, South Korea : 11.9 km - Lines: 1
İzmir, Turkey : 11.5 km
Buffalo, New York, United States: 10.6 km
Glasgow, United Kingdom : 10.4 km
Lima, Peru : 10.0 km (mostly elevated, partly at grade)
Sofia, Bulgaria : 9.9 km
Rennes, France : 9.0 km
Turin, Italy : 9,6 km (all underground)
Palma de Mallorca : 8.3 km
Yekaterinburg, Russia : 8.0 km
Dnipropetrovsk, Ukraine : 7.8 km
Kazan, Russia : 7.7 km
Porto, Portugal : 7.5 km - Lines: 1 (other 4 lines of light metro most on surface)
Newark, New Jersey, United States: 6.9 km (PATH not included)
Genoa, Italy : 5.6 km
Samara, Russia : 4.5 km
Catania, Italy : 3.8 km
Laon, France : 1.5 km
Dorfbahn Serfaus, Austria : 1.3 km