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Photo taken on Dec. 9, 2017 shows a Christmas Train at O'Hare station in Chicago, the United States. To celebrate Christmas holiday season, the Chicago Transit Authority introduced Christmas Train services. (Xinhua/Wang Ping)
Photo taken on Dec. 9, 2017 shows a Christmas Train at O'Hare station in Chicago, the United States. To celebrate Christmas holiday season, the Chicago Transit Authority introduced Christmas Train services. (Xinhua/Wang Ping)