'To go forward" or "to advance') was a type of heavy freight steam locomotive introduced in 1956 by the China Railway.

The prototypes and early production of the class were designated HP (Chinese: 和平; pinyin: Hé Píng; lit.

[1][2] The main tranche of production took place at Datong, beginning in 1964 starting with locomotive HP 101.

[1] QJs were equipped with mechanical stokers, feedwater heaters, electric lights, and air horns.

Steam traction officially ended on the Chinese national rail network in 2002, but a few units remained in use up to 2003 on minor lines.

[1] Two engines withdrawn from use in China, numbers 6988 and 7081 (both former Jitong Railway), were originally acquired by the Iowa Interstate Railroad and later donated to Central States Steam Preservation Association.

[16] Both the IAIS QJs are out of service as of 2022 for mandated FRA 1472-day inspections with repairs for overhaul to restored.

The diesel-style bell originally installed when it arrived in Iowa was replaced with a steam engine type bell, the Chinese headlights were replaced with an American style light with a cast number plate under it, and an American steam whistle was installed.