BOSTON, USA - APRIL 4: View of Copley Square subway station in Massachusetts, USA on April 4, 2012. The "T" is the fourth busiest subway system in the USA with over 598 thousand trips a day.
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BOSTON, USA - APRIL 4: View of Copley Square subway station in Massachusetts, USA on April 4, 2012. The "T" is the fourth busiest subway system in the USA with over 598 thousand trips a day.