Conductors from the China Railway Beijing Group Co watch the K3/4 train, which runs from Beijing to Moscow via Ulan Bator, hang the national emblem after an overhaul in Beijing on May 19, 2020. The route began on May 24, 1960. (Photos by Zou Hong/chinadaily.com.cn)

A staff member hangs the national emblem after an overhaul of the K3/4 train in Beijing on May 19, 2020.

Sun Guoxiang, a conductor who is the same age as the K3/4 train, checks on the train in Beijing on May 19, 2020.