BJ were made in two different versions, a standard version and a kou'an (port) version.China Railways DF7D [zh], a diesel electric locomotive based on DF7B, has a similar appearance to the Beijing locomotive.
From 2002 theKorean 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 aroundP'yŏngyang.[2] At least 33 have been delivered, numbered in the 내연301 - 내연333 series (내연 =Naeyŏn, "internal combustion"); most are still painted in their original Chinese blue livery, but a few have been repainted into the standardNorth Korean scheme of light blue over dark green, and at least one, 내연310, is painted in a scheme identical to the Chinese green livery used on ChineseDF4 locomotives.
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