Alstom Metropolis

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Alstom Metropolis
A Metropolis train on Sydney Metro
Stock type	Electric multiple unit
Manufacturer	Alstom
Constructed	1993–present (rubber-tyred) 1998–present (conventional steel wheel)
Specifications
Traction system	Alstom ONIX or OPTONIX IGBT–VVVF
Electric system(s)	Overhead line, 1,200 V DC, 25 kV 50 Hz AC, 1,500 V DC Third rail, 750, 1,500 V DC
Track gauge	1,432 mm (4 ft 8+3⁄8 in) (Bucharest) 1,435 mm (4 ft 8+1⁄2 in) (most trains) 1,600 mm (5 ft 3 in) (Brazil)

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.^[1] 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.