TheYellow Line orLine 4 is one of the under construction lines ofChennai Metro, stretching for 26.1 km (16.2 mi) betweenLighthouse andPoonamallee Bypass. 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.
The construction of the first phase ofChennai Metro started in June 2009.[2] Commercial operations started on thegreen line in June 2015.[3][4][5] On 10 February 2019, the extension ofblue line was opened, completing the first phase of the metro.[6]
In July 2016,Government of Tamil Nadu announced that the second phase would have three lines totaling 104 km (65 mi) in length with 104 stations.[7][8] Two corridors would extend fromMadhavaram Milk Colony connecting withSiruseri andSholinganallur respectively with the third corridor connectingKoyambedu withLighthouse. In July 2017, the state government announced an extension in Phase II, involving an extension of line four fromLighthouse up toPoonamallee with an intersection with theMadhavaram–Sholinganallur line atAlwarthirunagar. The line will extend to 26.1 km (16.2 mi) with 16 km (9.9 mi)elevated and 10.1 km (6.3 mi)underground. It will consist of 30 stations including 12 undergrounds stations.[9][10] The stations for the second phase were designed to be smaller than the existing stations operational in the first phase.[11]
On 20 November 2020, foundation stone for the second phase was laid and construction commenced.[12] In November 2022, Alstom was awarded the contract to supply metro coaches for the phase II expansion.[13] In May 2023, CMRL announced a revised plan for the second phase. As per the plan, the line will extend for 26.1 km (16.2 mi) with 27 stations.[14][15]
The second phase is estimated to cost₹632.46 billion (US$7.5 billion) of which initially₹47.1 billion (US$560 million) was loaned byJapan International Cooperation Agency.[9][16][17] On 14 February 2021, thePrime Minister of India announced that the government has set aside₹630 billion (US$7.5 billion) for the construction of phase II and further extension.[18]
| Line Name | Terminals | Length (km) | Stations | Status | |
|---|---|---|---|---|---|
| Yellow Line | Poonamallee Bypass | Vadapalani | 15.8 | 11 | Opens March 2026 |
| 6 | Opens June 2026 | ||||
| Vadapalani | Lighthouse | 10.3 | 10 | Under construction | |
In January 2025, Chennai Metro announced that the operations onPoonamallee Bypass toVadapalani stretch will start in February 2026, with no intermediate stoppages at stations from Alapakkam to Saligramam.[20]
In 2022, the state government proposed an extension plan for the fourth line from Poonamalee toParandur, covering an approximate 43.6 km (27.1 mi).[21] Detailed Project Report (DPR) of the line was prepared and submitted toGovernment of Tamil Nadu which approved the line in June 2025. This extension would be implemented in 2 phases, fromPoonamallee Bypass to Sunguvarchatram in first phase and then to Parandur in second phase. The DPR is currently forwarded toGovernment of India for final approval.[22] Another extension of the corridor eastward fromLighthouse toHigh Court is also being planned.[23]
| Line | Terminals | Length | Stations | Status | |
|---|---|---|---|---|---|
| Yellow Line | Poonamallee | Sunguvarchatram | 27.9 km (17.3 mi) | 14 | DPR approved by state |
| Lighthouse | High Court | 7 km (4.3 mi) | TBD | Planned | |
| Yellow Line | ||||||
|---|---|---|---|---|---|---|
| S.No | Station Name[19] | Expected Opening[24] | Connections | Station Structure | ||
| English | Tamil | Station Type | Platform Level Type | |||
| 1 | Lighthouse | கலங்கரை விளக்கம் | December 2027 | Underground | Island | |
| 2 | Kutchery Road | கச்சேரி சாலை | December 2027 | Underground | Island | |
| 3 | Thirumayilai | திருமயிலை | December 2027 |  Thirumayilai(Chennai MRTS) Purple Line (Under Construction) | Underground | Island |
| 4 | Alwarpet | ஆழ்வார்பேட்டை | December 2027 | Underground | Island | |
| 5 | Bharathidasan Road | பாரதிதாசன் சாலை | December 2027 | Underground | Island | |
| 6 | Boat Club | படகு குழாம் | December 2027 | Underground | Island | |
| 7 | Nandanam | நந்தனம் | December 2027 | Blue Line | Underground | Island |
| 8 | Panagal Park | பனகல் பூங்கா | March 2027 | Underground | Island | |
| 9 | Kodambakkam | கோடம்பாக்கம் | March 2027 | Kodambakkam | Underground | Island |
| 10 | Kodambakkam Powerhouse | கோடம்பாக்கம் பவர்ஹவுஸ் | June 2026 | Elevated | Side | |
| 11 | Vadapalani | வடபழனி | March 2026 | Green Line | Elevated | Side |
| 12 | Saligramam | சாலிகிராமம் | June 2026 | Elevated | Island | |
| 13 | Saligramam Warehouse | சாலிகிராமம் கிடங்கு | June 2026 | Elevated | Island | |
| 14 | Alwarthirunagar | ஆழ்வார்திருநகர் | June 2026 | Red Line (Under Construction) | Elevated | Island |
| 15 | Valasaravakkam | வளசரவாக்கம் | June 2026 | Red Line (Under Construction) | Elevated | Island |
| 16 | Karambakkam | காரம்பாக்கம் | June 2026 | Red Line (Under Construction) | Elevated | Island |
| 17 | Alapakkam | ஆலப்பாக்கம் | June 2026 | Red Line (Under Construction) | Elevated | Island |
| 18 | Porur Junction | போரூர் சந்திப்பு | March 2026 | Elevated | Side | |
| 19 | Porur Bypass | போரூர் புறவழிச்சாலை | March 2026 | Elevated | Island | |
| 20 | Thelliyaragaram | தெள்ளியார் அகரம் | March 2026 |  Sri Ramachandra Medical College | Elevated | Island |
| 21 | Iyyapanthangal | ஐயப்பன்தாங்கல் | March 2026 |  Iyyapanthangal Bus Terminus | Elevated | Island |
| 22 | Kattupakkam | காட்டுப்பாக்கம் | March 2026 | Elevated | Island | |
| 23 | Kumananchavadi | குமணன்சாவடி | March 2026 | Elevated | Island | |
| 24 | Karayanchavadi | கரையான்சாவடி | March 2026 | Elevated | Island | |
| 25 | Mullaithottam | முல்லைத்தோட்டம் | March 2026 | Elevated | Island | |
| 26 | Poonamallee | பூவிருந்தவல்லி | March 2026 | Poonamallee Bus Terminus | Elevated | Side |
| 27 | Poonamallee Bypass | பூவிருந்தவல்லி புறவழிச்சாலை | March 2026 | Elevated | Side | |
§ under construction
|  | |||||
See also | ||||||
Bold represents terminal station on the respective main or branch line Stations initalics are Proposed/Under Construction Stations inBold and italics are terminal stations Proposed/Under Construction | ||||||
