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Passengers queue in line for photos with Santa Claus in Chicago, the United States, on Dec. 9, 2017. To celebrate Christmas holiday season, the Chicago Transit Authority introduced Christmas Train services. (Xinhua/Wang Ping)
Passengers queue in line for photos with Santa Claus in Chicago, the United States, on Dec. 9, 2017. To celebrate Christmas holiday season, the Chicago Transit Authority introduced Christmas Train services. (Xinhua/Wang Ping)