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Commuters step off the metro train, one of the busiest metro systems in the world, in Mexico City, Mexico May 7, 2021. REUTERS/Carlos Jasso Stock Photo - Alamy
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Commuters throng in a subway station of the Moscow Metro in Moscow, Russia, 4 July 2018. The Moscow Metro is one of the busiest metro systems in the Stock Photo - Alamy
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10 busiest metro systems in the World : r/MapPorn
