Millions Of Americans Travel Ahead Of Thanksgiving Holiday

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Passengers wait in line to board their trains at Union Station... News PhotoBusiness,Finance,Full Length,Horizontal,Human Interest,Passenger,Train - Vehicle,Transportation,USA,Union Station - Washington DC,Waiting,Washington DCPhotographer Collection: Getty Images News 2012 Getty ImagesWASHINGTON, DC - NOVEMBER 21: Passengers wait in line to board their trains 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)