Ma Shi'an is a train marshalling worker in north China's Shanxi Province.
The 59-year-old has been devoted to smooth and safe cargo transportation for three decades.
He works at Hudong Station, China Railway Taiyuan Group.
As a major station along the Datong-Qinhuangdao Railway, it sees nearly a hundred pairs of coal-laden trains formed, split up, departing, or passing here every day.
Over the decades, Ma also witnessed the development of China's railway network.
Ma will soon retire. But he says the earnest service spirit of railway workers will pass on.
Produced by Xinhua Global Service