Harmony series electric locomotive is CRRC Corporation Limited cooperation with foreign enterprises, the introduction of advanced technology, and the localization of a new generation of ac drive goods (guest) locomotive. Is divided into 1200 kw per shaft harmonious electric 1, 2, 3; 1 on behalf of zhuzhou electric locomotive plant; 2 for datong locomotive factory; 3 on behalf of dalian locomotive factory. Every axis of 1600 kw of harmonious 1 b, 2 b, 3 b two generations of 9600 kw high-power locomotives. Design a top speed of 120 km/h. New launched in 2012, is dedicated to quasi high-speed passenger two six axis locomotive, uniaxial 1200 kw, the harmony of total power of 7200 kw electric 1 d, 3 d type electric locomotive, maximum operating speed of 160 km/h. Now there's HXD1G and HXD3G.
As of May 2017, HXD3D has produced 600 sets.
