A passenger takes photos of a China-Belgium theme train of Shanghai Metro Line 2 bearing character images from Belgian comic "The Smurfs" in East China's Shanghai, Oct 20, 2018. The theme train was launched by Shanghai Metro on Saturday as a special service to mark the upcoming China International Import Expo. [Photo/Xinhua]

Passengers get off a China-Belgium theme train of Shanghai Metro Line 2 bearing a character image from Belgian comic "The Smurfs" in East China's Shanghai, Oct 20, 2018. The theme train was launched by Shanghai Metro on Saturday as a special service to mark the upcoming China International Import Expo. [Photo/Xinhua]