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A rapid transit, underground, subway, elevated or metro(politan) system is a railway — usually in an urban area — with a high capacity and frequency of service and grade separation from other traffic. More than 160 cities have rapid transit systems, totaling more than 8,000 km (4,900 miles) of track and 7,000 stations.[1] Twenty-five cities have new systems under construction.[citation needed]
The oldest rapid transit system in the world is the London Underground, which opened in 1863 and was then called the Metropolitan Railway.[2] The Underground remains one of the most extensive rapid transit systems in the world



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