A train headed south navigates its way through a thick fog shrouding the Amtrak Railroad Bridge, left, during the afternoon Thursday, Dec. 5, 2013, from the Kenneth Streeter Boat Launch in Groton.
A lone man walks along the boardwalk at Mystic River Park as a heavy fog blankets the area Thursday Dec. 5, 2013.
A thick fog shrouds the Amtrak Railroad Bridge, left, and the Goldstar Memorial Bridge northbound, center and southbound right, during the afternoon Thursday, Dec. 5, 2013, from the Kenneth Streeter Boat Launch in Groton.
Nicholas Humiston, 3, left, of West Hartford and Jonathon Costello, 3, right, of Middletown look out the window moments before the North Pole Express leaves the Essex Steam Train station Thursday, Dec. 5, 2013. The North Pole Express is a holiday tradition where aboard the train there is a The Night Before Christmas musical performed and passengers meet Santa and Mrs. Claus and participate in singalongs.