BJ were made in two different versions, a standard version and a kou'an (port) version. China Railways DF7D, a diesel electric locomotive based on DF7B, has a similar appearance to the Beijing locomotive.
From 2002 the Korean State Railway has received a number of BJ class locomotives second-hand from China. They are used mostly for heavy shunting and on local freight trains around P'yŏngyang. Thirty have been delivered, numbered in the 내연301 - 내연330 series (내연 = Naeyŏn, "internal combustion"); most are still painted in their original Chinese blue livery, but a few have been repainted into the standard North Korean scheme of light blue over dark green.
In January, Mu was invited to take part in a program at ChinaCentralTelevision in Beijing, introducing his business and life and promoting the farm produce of Ningxia. This was the first time Mu had returned to Beijing since he left the capital in 2020.
Days later, Beijing announced the replacement of two generals leading the People’s Liberation ArmyRocketForce, the military branch overseeing the nation’s arsenal of nuclear and ballistic missiles ... Beijing has never issued an explanation for Qin’s removal nor said that the former minister was under investigation.