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People watch the model railroad during the Union Station Summer Train Festival in Los Angeles, the United States, on July 14, 2018. The festival featured virtual reality train ride, model railroad display and various children's activities. (Xinhua/Zhao Hanrong)

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Visitors wait to board an Amtrak train during the Union Station Summer Train Festival in Los Angeles, the United States, on July 14, 2018. The festival featured virtual reality train ride, model railroad display and various children's activities. (Xinhua/Zhao Hanrong)

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Visitors wait to board an Amtrak train during the Union Station Summer Train Festival in Los Angeles, the United States, on July 14, 2018. The festival featured virtual reality train ride, model railroad display and various children's activities. (Xinhua/Zhao Hanrong)

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