All map features are labeled with their appropriate source in the shapefile or CartoDB attribute tables.
Barcelona: Autoritat del Transport Metropolità (ATM), Ajuntament de Barcelona, TRAM, Transports Metropolitans de Barcelona (TMB)
Hong Kong: Mass Transit Railway (MTR), The Government of the Hong Kong Special Administrative Region
London: Transport for London (TfL), Greater London Authority, Office for National Statistics,VisitBritain
Los Angeles: Los Angeles County Metropolitan Transportation Authority (LACMTA), Metrolink, National Transit Database (NTD), U.S. Census, Discover Los Angeles
Madrid: Consorcio Regional de Transportes Madrid (CRTM), Eurostat
Mexico City: Ciudad de Mexico Secretería de Movilidad, Servicio de Transportes Elèctricos (STE)
Montreal: Agence métropolitaine de transport (AMT), Société de transport de Montréal (STM)
New York City: Metropolitan Transportation Authority (MTA), Port Authority of New York & New Jersey (PANYNJ), New Jersey Transit (NJT), National Transit Database (NTD), U.S. Census, New York State Department of Motor Vehicles (NYS DMV)
Paris: Régie Autonome des Transports Parisiens (RATP), Syndicat des Transports en Île-de-France (STIF), Observatoire de la mobilité en Île-de-France (Omnil), National Institute of Statistics and Economic Studies (INSEE), Eurostat
Santiago: Directorio de Transporte Público Metropolitano (DTPM), Instituto Nacional de EstadÌsticas Chile (INE)
Sao Paulo: São Paulo Metrô (SPM), Empresa Metropolitana de Transportes Urbanos de São Paulo, World Population Statistics, Prefeitura de São Paulo
Seoul: Seoul Metropolitan Government (SMG), World Population Statistics, Korea Tourism Organization (KTO)
Singapore: Singapore Land Transport Authority (LTA), SMRT Corporation
Stockholm: Storstockholms Lokaltrafik (SL), Statistics Sweden
Tokyo: East Japan Railway Company (JR East), Tokyo Metro, Tokyo Metropolitan Government
Vienna: Wiener Linien (WL), City of Vienna, Eurostat
Washington D.C.: Washington Metropolitan Area Transit Authority (WMATA), National Transit Database (NTD), U.S. Census, Washington D.C. Department of Motor Vehicles (DC DMV)
GDP for all cities: Brookings Institute
Notes on Ridership Data
Current ridership numbers reflect the most recent available, 2012-2014
Notes on Financial Data
For the most part, the financial statistics in the table represent the entire metro system in each city. However, there are a few cases where only a part of the metro system or more than the metro are included:
- Seoul: Includes Seoul Metro, one of the 4 main metro operators in the city. This represents 4 out of 18 metro lines.
- Los Angeles & Singapore: Include both the heavy rail and light rail because the light rail systems in these cities are closely integrated with the heavy rail metro.
- Montreal, New York City & Santiago: Include both the metro and bus systems because they are overseen by the same umbrella agency and it is difficult to separate the data.