Li Xinhai, a subway maintenance worker, is working at the parking lot of the 13th line of the Qingdao Metro on November 27, 2018. (Photos: VCG)

"In some ways, my work is similar to a doctor, as doctors treat patients and we treat the railways," Li said.

Li, 29, has checked countless railways throughout the construction of Line 13 in Qingdao, East China's Shandong Province.

“Every time we overhaul a track, we must concentrate and we can’t miss any problems. Thus, no matter how slow we creep, we will not miss a thing,” Li said.

Qingdao Metro Line 13 ended its no-load trial operation on December 1, and will soon start trial operation with passengers.

“It takes detailed observation and a strong sense of responsibility in our work to overcome various problems. As long as we imagine smooth journeys for the passengers, all the hard work is worthwhile,” Li added.

Li's team is in charge of the Lingshanwei parking lot, which covers 20 groupings of roads and 19 tracks.

On average, each worker needs to walk 10 kilometers a day and check the joints of 400 rails within 11 hours. (Compiled by Dong Feng)