S trains (市郊列车; Shijiao Lieche) in China Railways are classic regular rail trains, and mostly run on the Beijing-Zhangjiakou Railway as part of the Beijing Suburban Railway’s Line S2. They are also making an appearance on the Jizhou North – Tianjin North line.

The following train numbers are in use:

• S201 – S288: All Beijing Suburban Railways Line S2 trains