[1] A total of nineteen, classified "Pashi" (パシ) class, were built by Kawasaki, Kisha Seizō and Hitachi, fourteen for use on both express and ordinary passenger trains on the Jingtu Line, and five for use on the Haike (Keshan–Bei'an) and Taike lines (Tai'an–Keshan) at the same time.

[1] In 1938, twelve Manchukuo National Pashiku class engines (numbers 566–569 and 571–578, all of the "New Large" type) were transferred to North China Transport, and in 1941 North China Transport ordered another 57 identical units from Kawasaki, numbered 1533–1589.

In 1941, eight were built by Kawasaki for the Central China Railway, which designated them KC100 class, numbered KC1001 through KC1008.

In common with many steam classes, the cabside number often didn't include the suffix, so SL6 631 would have SL631 painted on the loco.

By 1990, most of the survivors were concentrated in Manchuria, at Dashiqiao, Jilin and Baicheng depots, whilst at the other end of the country, a few remained in use at Chengdu.