Metro and monorail systems in China:

Beijing | Changchun | Changsha | Changzhou | Chengdu | Chongqing | Dalian | Dongguan | Fuzhou | Guang'an | Guangzhou | Guiyang | Hangzhou | Harbin | Hefei | Hohhot | Hong Kong | Jinan | Jinhua | Kunming | Lanzhou | Liuzhou | Luoyang | Macau | Nanchang | Nanjing | Nanning | Nantong | Ningbo | Qingdao | Shanghai | Shaoxing | Shenzhen | Shenyang | Shijiazhuang | Suzhou | Taiyuan | Taizhou | Tianjin | Ürümqi | Wenzhou | Wuhan | Wuhu | Wuxi | Xi'an | Xiamen | Xuzhou | Zhengzhou

Tram systems in China:

Beijing | Changchun | Chengdu | Dalian | Guangzhou | Hong Kong | Huai'an | Mengzi | Nanjing | Qingdao | Sanya | Shanghai | Shenyang | Shenzhen | Suzhou | Tianjin | Tianshui | Wuhan | Zhuhai

Metro and tram systems in Taiwan:

Kaohsiung | Taichung | Taipei | Taoyuan

Systems under construction in italics!

Wikipedia link

General Links on China:

Rapid Transit in China at Wikipedia

Urban Rail Transit in China at Wikipedia

China Metro

Ditiezu.com (China Metro Forum)

Tracking China (including subway/metro info) - not updated...