Why do so many trains have the word "harmony" written on them?

The Harmony (HX) locomotive (commonly known as the locomotive) is not the same thing as the Harmony (CRH) EMU. Before the sixth major speed increase, domestic locomotives were mainly: Dongfeng DF diesel locomotives and Shaoshan SS electric locomotives. After the sixth speed increase, in order to create more powerful locomotives, the Ministry of Railways worked with several foreign companies to jointly develop a new type of locomotive. The model is "Harmony, HX". The electric locomotive is "Harmony HXD" in dark blue; the diesel locomotive is "Harmony HXD". Harmony HXN" dark green.