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In this Aug. 7, 2013 photo, passengers ride escalators to access subway platforms in Sao Paulo, Brazil. Exhausted workers often travel two or three hours each way, crammed into tightly packed buses and subways. And that's if things work as planned. Commuter train breakdowns are common, and at times enraged commuters sometimes have clashed with police after being stranded. (AP Photo/Andre Penner)