The Alstom Metropolis is a family of electric multiple units designed and produced by the French rolling stock manufacturer Alstom. It is designed for high capacity rapid transit or metro rail infrastructure systems. Trains can be run in various configurations, the length alone varying between two and ten cars; it is also suitable for both manned or unmanned operations.
More than 4,000 Metropolis cars have been manufactured, the type is reportedly in service with 50 operators distributed around the world. Cities operating the Metropolis include Singapore, Shanghai, Budapest, Warsaw, Nanjing, Montreal, Buenos Aires, São Paulo, Lima, Santiago, Barcelona, Guadalajara, Istanbul, Santo Domingo, Chennai, Kochi, Dubai, Lucknow, Sydney, Amsterdam, Xiamen, Hanoi, and Riyadh.