Cluster 0

• Buenos Aires Underground
• Yerevan Metro
• Baku Metro
• Minsk Metro
• Brussels Metro
• Belo Horizonte Metro
• Brasília Metro
• Rio de Janeiro Metro
• São Paulo Metro
• Sofia Metro
• Montreal Metro
• SkyTrain (Vancouver)
• Santiago Metro
• MTR
• Medellín Metro
• Copenhagen Metro
• Santo Domingo Metro
• Helsinki Metro
• Lille Metro
• Lyon Metro
• Marseille Metro
• Paris Métro
• Rennes Metro
• Toulouse Metro
• Tbilisi Metro
• Berlin U-Bahn
• Berlin S-Bahn
• Hamburg U-Bahn
• Munich U-Bahn
• Nuremberg U-Bahn
• Athens Metro
• Budapest Metro
• Brescia Metro
• Catania Metro
• Genoa Metro
• Milan Metro
• Rome Metro
• Turin Metro
• Fukuoka City Subway
• Astram Line
• Osaka Metro
• Sapporo Municipal Subway
• Almaty Metro
• Pyongyang Metro
• Rapid KL
• Mexico City Metro
• Monterrey Metro
• Amsterdam Metro
• Rotterdam Metro
• Oslo Metro
• Manila Light Rail Transit System
• Lisbon Metro
• Bucharest Metro
• Kazan Metro
• Moscow Metro
• Nizhny Novgorod Metro
• Novosibirsk Metro
• Saint Petersburg Metro
• Samara Metro
• Yekaterinburg Metro
• Mass Rapid Transit (Singapore)
• Barcelona Metro
• Metro Bilbao
• Madrid Metro
• Stockholm metro
• Lausanne Metro
• Taipei Metro
• Ankara Metro
• Bursaray
• Istanbul Metro
• İzmir Metro
• Dnipro Metro
• Kharkiv Metro
• Dubai Metro
• Glasgow Subway
• London Underground
• Tyne and Wear Metro
• Metropolitan Atlanta Rapid Transit Authority
• MBTA Subway
• Chicago "L"
• Red Line (Cleveland)
• Los Angeles Metro Rail
• New York City Subway
• SEPTA
• Bay Area Rapid Transit
• Tren Urbano
• Washington Metro
• Tashkent Metro

Cluster 1

• Vienna U-Bahn
• Salvador Metro
• Toronto subway
• Prague Metro
• Manila Metro Rail Transit System
• Warsaw Metro
• BTS Skytrain
• Kiev Metro
• Baltimore Metro SubwayLink
• Metrorail (Miami-Dade County)

Cluster 2

• Algiers Metro
• Porto Alegre Metro
• Recife Metro
• Beijing Subway
• Changchun Subway
• Changsha Metro
• Chengdu Metro
• Chongqing Rail Transit
• Dalian Metro
• Dongguan Rail Transit
• Foshan Metro
• Fuzhou Metro
• Guangzhou Metro
• Guiyang Metro
• Hangzhou Metro
• Harbin Metro
• Hefei Metro
• Kunming Rail Transit
• Nanchang Metro
• Nanjing Metro
• Nanning Rail Transit
• Ningbo Rail Transit
• Qingdao Metro
• Shanghai Metro
• Shenyang Metro
• Shijiazhuang Metro
• Suzhou Rail Transit
• Tianjin Metro
• Ürümqi Metro
• Wuhan Metro
• Wuxi Metro
• Xiamen Metro
• Xi'an Metro
• Zhengzhou Metro
• Cairo Metro
• Namma Metro
• Chennai Metro
• Delhi Metro
• Hyderabad Metro
• Jaipur Metro
• Kochi Metro
• Kolkata Metro
• Lucknow Metro
• Mumbai Metro
• Isfahan Metro
• Mashhad Urban Railway
• Shiraz Metro
• Tabriz Metro
• Tehran Metro
• Naples Metro
• Kobe Municipal Subway
• Sendai Subway
• Busan Metro
• Daegu Metro
• Daejeon Metro
• Gwangju Metro
• Incheon Subway
• Seoul Metropolitan Subway
• Shinbundang Line
• Panama Metro
• Lima Metro
• Al Mashaaer Al Mugaddassah Metro line
• Kaohsiung Rapid Transit
• Taoyuan Metro
• MRT (Bangkok)
• Adana Metro
• Caracas Metro

Cluster 3

• Nagoya Municipal Subway
• Tokyo Metropolitan Bureau of Transportation
• Tokyo Metro
• Tokyo Monorail
• Rinkai Line
• Yokohama Municipal Subway
• Minatomirai Line