NEW YORK, NY - DECEMBER 05: A man walks past a subway stop in Manhattan two days after a man was pushed to his death in front of a train on December 5, 2012 in New York City. The incident was caught by a photographer and has since raised questions as to why someone didn't help the man before the train struck him. The New York City subway system, with 468 stations in operation, is the most extensive public transportation system in the world. It is also one of the world's oldest public transit systems, with the first underground line of the subway opening on October 27, 1904. (Photo by Spencer Platt/Getty Images)
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