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The DF4 is a type of diesel-electric locomotive that was first introduced in China in 1969. It is considered the most common locomotive in China and is used for both passenger and freight services.
The DF4 can be regarded as a family of related designs, with a number of significant variants. The original DF4, the DF4A and DF4B are all outwardly similar in appearance.
Production of the DF4 began in 1969 and continued until 2007. The first DF4 was built in Dalian, China. Early models of the DF4 experienced some technical problems, but later versions were more reliable.