The Yellow Line or Line 4 is one of the under construction lines of Chennai Metro, stretching for between and . The line will consist of 27 stations, out of which nine will be underground and 18 will be at grade or elevated. The colour code of the corridor was changed from Orange to Yellow in 2025.
Planning and construction Phase II The construction of the first phase of Chennai Metro started in June 2009. Commercial operations started on the green line in June 2015. On 10 February 2019, the extension of blue line was opened, completing the first phase of the metro.
In July 2016, Government of Tamil Nadu announced that the second phase would have three lines totaling in length with 104 stations. Two corridors would extend from connecting with Siruseri and respectively with the third corridor connecting Koyambedu with Lighthouse. In July 2017, the state government announced an extension in Phase II, involving an extension of line four from Lighthouse up to Poonamallee with an intersection with the Madhavaram–Sholinganallur line at Alwarthirunagar. The line will extend to with elevated and underground. It will consist of 30 stations including 12 undergrounds stations. The stations for the second phase were designed to be smaller than the existing stations operational in the first phase.
On 20 November 2020, foundation stone for the second phase was laid and construction commenced. In November 2022, Alstom was awarded the contract to supply metro coaches for the phase II expansion. In May 2023, CMRL announced a revised plan for the second phase. As per the plan, the line will extend for with 27 stations.
The second phase is estimated to cost of which initially was loaned by Japan International Cooperation Agency. On 14 February 2021, the Prime Minister of India announced that the government has set aside for the construction of phase II and further extension.
+Chennai Metro - Phase IILine NameTerminalsLength (km)StationsStatusYellow Line14.611Opens October 11, 20266Under construction11.510
In January 2025, Chennai Metro announced that the operations on to stretch will start in February 2026, with no intermediate stoppages at stations from Alapakkam to Saligramam. The opening has since been postponed due to Tamil Nadu Assembly election and is now expected in October 2026, during Prime Minister Narendra Modi's visit.
Phase II extension In 2022, the state government proposed an extension plan for the fourth line from Poonamalee to Parandur, covering an approximate . Detailed Project Report (DPR) of the line was prepared and submitted to Government of Tamil Nadu which approved the line in June 2025. This extension would be implemented in 2 phases, from to Sunguvarchatram in first phase and then to Parandur in second phase. The DPR is currently forwarded to Government of India for final approval. Another extension of the corridor eastward from Lighthouse to High Court is also being planned.
+Chennai Metro - Phase II Extension LineTerminals Length Stations StatusYellow Line PoonamalleeSunguvarchatram14DPR approved by state4 (TBD)DPR to be submitted to State
Stations Yellow LineS.NoStation NameExpected OpeningConnectionsStation Structure EnglishTamilStation TypePlatform Level Type1கலங்கரை விளக்கம்June 2028UndergroundIsland2கச்சேரி சாலைJune 2028UndergroundIsland3திருமயிலைJune 2028Thirumayilai (Chennai MRTS) (Under Construction)UndergroundIsland4ஆழ்வார்பேட்டைJune 2028UndergroundIsland5பாரதிதாசன் சாலைJune 2028UndergroundIsland6படகு குழாம்June 2028UndergroundIsland7நந்தனம்June 2028UndergroundIsland8பனகல் பூங்காJune 2028UndergroundIsland9கோடம்பாக்கம்June 2028 Kodambakkam (South Line)UndergroundIsland10கோடம்பாக்கம் பவர்ஹவுஸ்November 2026ElevatedSide11வடபழனிOctober 11 2026ElevatedSide12சாலிகிராமம்November 2026ElevatedIsland13விருகம்பாக்கம் தெற்குNovember 2026ElevatedIsland14ஆழ்வார்திருநகர்November 2026 (Under Construction)ElevatedIsland15வளசரவாக்கம்November 2026 (Under Construction)ElevatedIsland16காரம்பாக்கம்November 2026 (Under Construction)ElevatedIsland17ஆலப்பாக்கம்November 2026 (Under Construction)ElevatedIsland18போரூர் சந்திப்புOctober 11 2026ElevatedSide19போரூர் புறவழிச்சாலைOctober 11 2026ElevatedIsland20தெள்ளியாரகரம்October 11 2026 Sri Ramachandra Medical CollegeElevatedIsland21 அய்யப்பன் தாங்கல்October 11 2026 Iyyapanthangal Bus TerminusElevatedIsland22காட்டுப்பாக்கம்October 11 2026ElevatedIsland23குமணன்சாவடிOctober 11 2026ElevatedIsland24கரையான்சாவடிOctober 11 2026ElevatedIsland25Poonamallee Government Hospitalபூவிருந்தவல்லி அரசு மருத்துவமனைOctober 11 2026ElevatedIsland26பூவிருந்தவல்லி பேருந்து நிலையம்October 11 2026 Poonamallee Bus TerminusElevatedSide27பூவிருந்தவல்லி புறவழிச்சாலைOctober 11 2026ElevatedSide under construction
See also List of metro systems Rapid transit in India
References