Datong-Qinhuangdao railway is the first double-line electrified and heavy haul unit modern railway in China. It is also a national key construction project to enhance Shanxi coal transportation capacity. Officially started in 1985, the first-stage project was completed in 1988, second-stage project completed in 1992, and third-stage auxiliary project completed in 1998. The project introduced and developed a series of advanced technologies and equipment, adhered to the principle of "self-reliance first, international cooperation second", and finally realized localization of production. The successes in research, development, introduction and digestion of complete equipment for heavy haul train of Datong-Qinhuangdao railway improved the technical equipment level and the ability of developing and supporting manufacturing equipment of China's railway. The development of heavy haul transportation capacity of Datong-Qinhuangdao Railway marks that the technical level of China's railway heavy haul transportation has entered the world's advanced rank.