A train engineer looks out the window of his train in Datong city, of North China's Shanxi province, in 1988. [Photo by Yann Layma/provided to chinadaily.com.cn]

A train engineer peers out the door of the CRH5A high-speed train in Hunchun city, Northeast China's Jilin province, April 27, 2018. [Photo by Liu Shenku/provided to chinadaily.com.cn]