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 Central Metro, officially known as Puratchi Thalaivar Dr. M.G. Ramachandran Central metro station, is an underground metro station on the North-South Corridor of the Blue Line and Green Line of Chennai Metro in Chennai, India. Central metro station is spread over an area of 30,000 square metres (320,000 sq ft). On 31 July 2020, It has been named by Government of Tamil Nadu as Puratchi Thalaivar Dr. M.G. Ramachandran Central Metro to honor the All India Anna Dravida Munnetra Kazhagam founder and the former Chief Minister of Tamil Nadu M. G. Ramachandran.