The Green Line or Line 2 is one of the two lines of Chennai Metro, Phase 1 Project. The line stretches from Chennai Central to St. Thomas Mount. Out of the 17 stations, 9 stations are underground and 8 are elevated.

Chennai Metro is a rapid transit system serving the city of Chennai, India. As of April 2024, the operational network consists of two colour-coded lines covering a length of 54.1 km (33.6 mi) making it the fifth longest metro system in India. Chennai Metro Rail Limited (CMRL), a joint venture between Government of India and the Government of Tamil Nadu built and operates the Chennai Metro. The system uses standard gauge and has a mix of underground and elevated stations.