Wang Tiancheng, 24, has taken more than 100,000 photos about trains in nearly 30 countries and regions around the world. [Photo provided to chinadaily.com.cn]

A train goes through a forest on Ali Mountain in Taiwan in Sept 2015. [Photo by Wang Tiancheng/ for chinadaily.com.cn]

An international train of Beijing-Moscow rail line runs in Ulan Bator in Sept 2016. [Photo by Wang Tiancheng/ for chinadaily.com.cn]

A train runs in snow in the area of Greater Khingan Mountains, Northeast China’s Heilongjiang province, in Jan 2016. [Photo by Wang Tiancheng/ for chinadaily.com.cn]

A train runs in Vietnam in May 2017. [Photo by Wang Tiancheng/ for chinadaily.com.cn]

Passengers look out from a train in Zambia in April 2018. [Photo by Wang Tiancheng/ for chinadaily.com.cn]

A train driver waits for rescue after a rail line broke down in Malaysia in Jan 2018. [Photo by Wang Tiancheng/ for chinadaily.com.cn]

A train driver in Tanzania in April 2018. [Photo by Wang Tiancheng/ for chinadaily.com.cn]

A train stops at Yakeshi city of Hulunbuir, North China's Inner Mongolia autonomous region, in Feb 2019. [Photo by Wang Tiancheng/ for chinadaily.com.cn]