DF4 no.3110 (Zhengzhou locomotive depot,.Zhengzhou Railway Bureau) at Langfangbei Railway Station . It has been Leased to National Energy Group Langfang power plant since 2017. It is very common for factory and mining enterprises to lease locos from state railway in China. But this one's application management is provided by a private enterprise named CSALC (China Special Article Logistics Co., Ltd.) . After a few months ,they covered the original railway seal and put on their own logo