[[JustForFun/IThoughtItMeant Not the sandwich shop]]. Underground commuter rail.

Many of the great cities of the world have subway systems, metro systems, underground systems, what have you--they're trains underground is what counts. They tend to be part of the lifeblood of the city, an element of its character, a point of pride (or occasionally shame) for its citizens, and a record of its history. They develop their own unique cultures and quirks. In short, they are kind of awesome...which is why we made this index.

!! Subway systems of the world
%% The examples should either link to an article about the system or not at all. Linking to the city doesn't really cut it.

!!! Africa
* Algiers Metro
* UsefulNotes/CairoMetro

!!! Asia-Pacific
* Bangkok [=SkyTrain=] and Metropolitan Subway
* Beijing Subway
* Delhi Metro
* Hong Kong MTR
* Melbourne Metro
* Osaka Subway
* Seoul Metropolitan Subway
* Shanghai Metro
* Singapore MRT
* Sydney Metro (planned)
* UsefulNotes/TokyoSubways (Tokyo Metro, Toei Subway, and other lines frequently used)

!!! Europe
* UsefulNotes/AmsterdamMetro
* UsefulNotes/MetroDeBarcelona
* UsefulNotes/BerlinUAndSBahn
* UsefulNotes/BrusselsMetro
* [[UsefulNotes/BudapestMetro Budapest Metro (and other public transportation)]]
* UsefulNotes/CopenhagenStogAndMetro
* UsefulNotes/FrankfurtUAndSBahn (actually operates as light rail, known as "Stadtbahn" in German)
* UsefulNotes/GlasgowSubway
* UsefulNotes/HamburgUAndSBahn
* UsefulNotes/HelsinkiMetro
* UsefulNotes/LisbonMetro
* UsefulNotes/TheLondonUnderground
* UsefulNotes/MetroDeMadrid
* UsefulNotes/MilanMetroAndLineeS
* UsefulNotes/MoscowMetro
* UsefulNotes/MunichUAndSBahn
* UsefulNotes/NurembergUBahn
* UsefulNotes/NovosibirskMetro
* UsefulNotes/OsloTBane
* UsefulNotes/LeMetropolitain (Paris)
* UsefulNotes/PragueMetro
* UsefulNotes/RomeMetro
* UsefulNotes/RotterdamMetro (includes Randstad Rail, which is light rail)
* UsefulNotes/SaintPetersburgMetro
* UsefulNotes/StockholmMetro
* UsefulNotes/TurinMetro
* [[UsefulNotes/TyneAndWearMetro Tyne & Wear Metro]] (Newcastle—upon―Tyne & Sunderland; actually light rail)
* UsefulNotes/ViennaUAndSBahn
* UsefulNotes/WarsawMetro

!!! The Americas
* Brasília Metro
* Buenos Aires Metro
* Caracas Metro
* Lima Metro
* UsefulNotes/MexicoCityMetro - second biggest Metro in the Americas based on ridership (the biggest is in NYC)
* Montreal Metro
* Panama City Metro - opened in 2014 the [[/index]][[OverlyNarrowSuperlative oldest Metro in mainland Central America]]
* Rio de Janeiro Metro
* Santiago Metro
* São Paulo Metro
* [[index]]UsefulNotes/SubwaysOfTheUnitedStates
* UsefulNotes/TorontoSubway
* Vancouver [=SkyTrain=]