Subway systems of the world, presented on the same scale
Neil Freeman, 2004–10
format and dimensions vary
1 km 
1 mi
see at double this scale
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| Berlin BVG/S-Bahn Berlin |
London Transport for London |
New York MTA NYCT/PATH |
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| Tokyo TRTA |
Shanghai Shanghai Metro Group |
Madrid Metro de Madrid |
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| Seoul Seoul Metro |
Paris RATP |
Moscow Moskovskoe Metro |
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| México City El Sistema de Transporte Colectivo |
Chicago CTA |
Beijing Beijing Subway |
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| Osaka Osaka Municipal Transportation Bureau |
Washington WMATA |
Barcelona TMB |
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| Santiago Metro de Santiago |
Stockholm SL |
Hong Kong MTR |
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| Munich MVG |
Oslo Oslo T-banedrift |
Hamburg Hochbahn |
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| Busan Busan Transportation Corp |
Singapore SMRT |
Guangzhou Guangzhou Metro |
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| Nagoya Nagoya Municipal Subway |
Saint Petersburg Petersburgskiy Metropoliten |
Vienna VOR |
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| Philadelphia SEPTA/PATCO |
Newcastle Tyne and Wear Metro |
Toronto TTC |
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| San Francisco MUNI/BART |
Delhi Delhi Metro Rail |
Montreal STM |
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| Buenos Aires Metrovías |
Valencia Metrovalencia |
São Paulo Metrô |
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| Athens Attiko Metro |
Boston MBTA |
Atlanta MARTA |
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| Brussels STIB-MIVB |
Rotterdam RET |
Vancouver TransLink |
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| Budapest BKV |
Amsterdam GVB |
These are not all of the world's subway systems. You might be interested in the difference between subways and commuter rail.
Thanks to alan_cunningham for Atlanta, to jonathan.addleman for a Montreal map, to Kevin Keller and Michael Kitzman for links a LA map, to jamison for an SF MUNI map, and to ssp for Berlin S-bahn help. Further thanks to Greg Smith, clgonsal, Damien Fox & Matthew Corks for help with Toronto, and to Vincent Graux for a Brussels map. Many thanks to A. Feldman & A. Lorentzen for loans of Philadelphia & Budapest maps, respectively. Radical Cartography has a similar page.