Line S2 (), known as Nanjing-Ma'anshan Intercity Railway () in Ma'anshan Section, is a suburban rapid transit line in the Nanjing Metro system, officially put into operation on 22 April 2026 at 10:00. The line features passing loops for express services with express trains completing travel across the whole line in 30 minutes. Line S2 is the first inter-provincial metro line in Nanjing and also the second in Mainland China, the first being Line 11 of Shanghai Metro connecting Shanghai and Suzhou, Jiangsu province. It is also the first metro line in Mainland China to be jointly constructed, managed, and operated by two provinces.
History In 2020, the mayors of Nanjing and Ma'anshan jointly signed the "Ningma Intercity Railway Co-construction Cooperation Agreement".
The tender notice for the survey, design and review of the Nanjing-Ma'anshan intercity railway was released in September 2021. The first phase of the Nanjing section will have 8 stations and 26.9 kilometers, and the second phase will have 4 stations and 11.2 kilometers.
Construction of the Ma'anshan section, an elevated line from Cihugaoxinqu to Taibai, started on 30 December 2020. The Nanjing section started construction on December 28, 2021.
In December 2025, the Ma'anshan section and the Nanjing section will pass the project acceptance at the same time.
On 28 December 2025, the entire line officially started trial operation without passengers. From 1 March to 20 March 2026, the second phase of testing (running map) was implemented. On 10 April 2026, it successfully passed the completion acceptance. On 15 April 2026, the operation safety assessment of the Ma'anshan section was successfully completed, and the operation safety assessment of the Nanjing section was officially completed on 18 April.
On 22 April 2026 at 10:00, Line S2 was officially put into operation.
Opening timetable SegmentOpeningLengthStation(s)NameXishanqiao — Cihugaoxinqu April 22, 20268Nanjing section Phase 1 Cihugaoxinqu — Taibai 8 Ma'anshan section
Stations From 9:00 to 16:00 every day, starting from 23 April 2026, express trains departing from both terminals and will only stop at following stations: Jiangning Binjiang Development Zone, Hubeilu Erzhong, Yushandonglu.
Legend: ●All trains stop|No express trains△During the morning peak on weekdays, one express train departing from Taibai at 7:09 bound for Xishanqiao. Service Pattern Station name Connections Distance Location ●●△ YuhuataiNanjing, Jiangsu●|| ●|| ●|| ●|| Jiangning●●△ ●||●|| ●|| HuashanMa'anshan, Anhui●●△ ●|| ●●△ ●|| Yushan●|| ●|| Gushu DangtudongDangtu●●△
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