Tourists board the Taiyuan-Yuncheng tourist bullet train "Huanghe" (Yellow River in Chinese language) in Taiyuan, capital of north China's Shanxi Province, Aug. 21, 2018. The new tourist bullet train "Huanghe" came into operation here on Tuesday. More tourist bullet trains will be launched to boost tourism in north China's Shanxi Province. (Xinhua/Cao Yang)