The China Railways JS (Chinese: 建设; pinyin: Jiàn Shè; lit.

'Construction or Development') are a type of 2-8-2 tender steam locomotive manufactured for use on mainline freight trains, as well as for heavy shunting.

The JS was developed at the Dalian locomotive works[4] by combining the chassis of the China Railways JF with a new boiler.

[1][2] In the late 1980s, the Boone and Scenic Valley Railroad of Iowa, US, bought JS-8419 for $355,000.

Starting at 5001 avoided overlapping the numbers of the various types of JF occupying the 1 - 4100 (approx) range.