24-year-old locomotive inspector Yuan Kai works in the first locomotive maintenance yard of Ankang Locomotive Depot in Qinba Mountain District. Each shift had to inspect 8-10 locomotives, requiring them to bend down more than 1,000 times.
In less than four months of work, Yuan Kai has mastered the special inspection of motorcycles. With the basic skills of "seeing, hearing, listening and cutting", he discovered the hidden danger of damage to the traction motor wires three times.