Switchman Liu Jun works at the passenger train maintenance factory of Yantai Railway Station in Yantai, east China's Shandong Province, Feb. 11, 2018. The 57-year-old switchman Liu Jun has worked here for 40 years. This year marks the last year of his career because of the automation upgrade of the railway switches after the Spring Festival travel rush. (Xinhua/Tang Ke)

Switchman Liu Jun works at the passenger train maintenance factory of Yantai Railway Station in Yantai, east China's Shandong Province, Feb. 11, 2018. The 57-year-old switchman Liu Jun has worked here for 40 years. This year marks the last year of his career because of the automation upgrade of the railway switches after the Spring Festival travel rush. (Xinhua/Tang Ke)

Switchman Liu Jun works at the passenger train maintenance factory of Yantai Railway Station in Yantai, east China's Shandong Province, Feb. 11, 2018. The 57-year-old switchman Liu Jun has worked here for 40 years. This year marks the last year of his career because of the automation upgrade of the railway switches after the Spring Festival travel rush. (Xinhua/Tang Ke)

Switchman Liu Jun works at the passenger train maintenance factory of Yantai Railway Station in Yantai, east China's Shandong Province, Feb. 11, 2018. The 57-year-old switchman Liu Jun has worked here for 40 years. This year marks the last year of his career because of the automation upgrade of the railway switches after the Spring Festival travel rush. (Xinhua/Tang Ke)