Conductors from the China Railway Beijing Group Co pose in front of the K3/4 train, which runs from Beijing to Moscow via Ulan Bator, after an overhaul in Beijing on May 19, 2020. The route began on May 24, 1960. (Photo: China News Service/Jia Tianyong)

Sun Guoxiang, a conductor who is the same age as the K3/4 train, checks on the train in Beijing on May 19, 2020. (Photo: China News Service/Jia Tianyong)

A staff member hangs the national emblem after an overhaul of the K3/4 train in Beijing on May 19, 2020. (Photo: China News Service/Jia Tianyong)
 

The photo shows old and new menus for dining car of the K3/4 train. (Photo: China News Service/Jia Tianyong)

Staff members check on the train in Beijing on May 19, 2020. (Photo: China News Service/Jia Tianyong)