The first steam locomotive in China is thought to be a 2 ft 6 in (762 mm) gauge 0-4-0T engine used on the Shanghai-Wusong railway.
Towards the end of the 19th century concessions obtained from the Qing dynasty enabled foreign powers (Germany, Russia, France and Great Britain) to build railways in China, and they introduced a variety of foreign-built machines.
Later Japan gained control over Manchuria as a result of the Treaty of Portsmouth following the Russo-Japanese War and created the South Manchuria Railway from their acquisitions - resulting in Japanese as well as American locomotives being imported into the north-east of China.
Both post 2000 introductions of asynchronous AC motor driven locomotives and high speed trains based on technology transfer arrangements with other countries have been given the common name "Harmony" series.
Ministry of Railways deputy chief engineer Zhang Shuguang explained that the name was to represent energy efficiency and good environmental credentials as well as indicating smooth running of complicated systems.