Millions Of Americans Travel Ahead Of Thanksgiving Holiday

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A train conductor checks passengers' tickets on a platform at Union... News PhotoBusiness,Finance,Full Length,Horizontal,Human Interest,Passenger,Ticket,Train - Vehicle,Transportation,USA,Union Station - Washington DC,Washington DCPhotographer Collection: Getty Images News 2012 Getty ImagesWASHINGTON, DC - NOVEMBER 21: A train conductor checks passengers' tickets on a platform at Union Station November 21, 2012 in Washington, DC. Travelers are expected to flood the nation’s transportation system for the Thanksgiving holidays. (Photo by Alex Wong/Getty Images)