China's vast railway system handles the world's largest annual human migration every year, transporting millions of people every day. Zhang Xiaolei, 45, is an engine flaw detection worker on the system's huge locomotives. It is workers like her who make the running of the magnificent railway possible.

"My Day" is a CGTN special series that tells stories of ordinary people from all walks of life. We record one day in their life to get a glimpse of how they work, what they dream of, and what keeps them going.