Dongfeng locomotives (DF7J) diesel locomotive (东风7J型柴油机车)

Dongfeng 7J diesel locomotive (DF7J) is one of the diesel locomotives used by Chinese railways. Dongfeng locomotive is also the second shunting diesel locomotive in China that adopts AC power transmission technology after the NJ1 locomotive. Dongfeng locomotive was developed by Beijing Erqi Locomotive Works in 2003. Dongfeng locomotive designed and manufactured, with a nominal power of 1,730 kilowatts and a maximum operating speed of 100 km/h. In order to meet the shunting and traction needs of 5000-ton heavy-duty freight trains, and to improve the operating efficiency of marshalling stations, Beijing Erqi Locomotive Works began to develop AC drive shunting diesel locomotives in the early 2000s, with Dongfeng 7C and Dongfeng 7E diesel locomotives Based on this, a locomotive was trial-produced in 2003. According to the telegram instructions of the Transport Bureau of the Ministry of Railways of the People’s Republic of China “Yun Zhan Ji Yun [2003] No. 108“, this locomotive is finalized as the