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Commuters wait for the train at a subway station in downtown Sao Paulo May 28, 2013. The metropolitan area of some 20 million people has only about 45 miles (72 km) of mostly underground rail. Sao Paulo has some of the world's worst traffic jams, with commuters sometimes needing three hours to travel about nine miles (14 km) across Brazil's biggest city and financial capital. Picture taken May 28, 2013. REUTERS/Nacho Doce (BRAZIL - Tags: TRANSPORT SOCIETY) - RTX105HQ