Shanghai Metro - Wikipedia
https://en.m.wikipedia.org/wiki/Shanghai_Metro
The Shanghai Metro (Chinese: 上海地铁; pinyin: Shànghǎi Dìtiě) is a rapid transit system in Shanghai, operating urban and suburban transit services to 14 of its 16 municipal districts and to Kunshan, Jiangsu Province.Served as a part of Shanghai rail transit, the Shanghai Metro system is the world's biggest metro system by route length, totaling 802 kilometres (498 mi).