# Line 5 (Chennai Metro)

The Red Line or Line 5 is one of the planned lines of Chennai Metro. It is part of the second phase of the project and the under construction line stretches from Madhavaram Milk Colony to Sholinganallur. The 44.6 km (27.7 mi) long line will consist of 45 stations, out of which six will be underground and 39 will be at grade or elevated. A branch line of corridor five, known as Line 5B, from Koyambedu to Pattabiram has been proposed with its Detailed Project Report submitted to Government of Tamilnadu on February 2025, currently awaiting approval. The 21.76 km (13.52 mi) branch line will consist of 19 elevated stations.

## 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 104 km (65 mi) in length with 104 stations. Two corridors would extend from Madhavaram connecting with Siruseri and Sholinganallur respectively (lines 3 and 5) with the third corridor connecting Koyambedu with Lighthouse (line 4). The fifth line connecting Madhavaram Milk Colony and Sholinganallur will extend to 47 km (29 mi) of which 41.2 km (25.6 mi) would be elevated and 5.8 km (3.6 mi) underground. It will consist of 48 stations including six 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 revising the station count on the fifth line to 45. As per the final plan, the fourth line will extend for 45.4 km (28.2 mi).
Chennai Metro - Phase II :
| Line Name | Terminals | Terminals | Length (km) | Stations | Status |
| Red Line | Madhavaram Milk Colony | Sholinganallur | 44.6 | 45 | Under construction |
The second phase is estimated to cost ₹63,246 crore (US$7.3 billion) of which initially ₹4,710 crore (US$540 million) was loaned by JICA. On 14 February 2021, Prime Minister of India announced that the government has set aside ₹63,000 crore (US$7.3 billion) for the construction of phase II and further extension. The line is expected to be completed by 2028.

### Phase II extension

In 2022, the state government proposed a branch extension for the fifth line from Koyambedu to Avadi, covering an approximate 16.1 km (10.0 mi). In early 2024, feasibility report was submitted by CMRL for the proposed expansion of the line, green lighting the same. It was later decided to extend the line till Pattabiram. Detailed Project Report is prepared and submitted to Government of Tamil Nadu on February 2025, and the project is currently awaiting approval. A depot near Pattabiram stretch of Outer Ring Road is also planned.
Chennai Metro - Phase II Extension - Line 5B :
| Line | Terminals | Terminals | Length | Stations | Status |
| Red Line | Koyambedu | Pattabiram | 21.76 km (13.52 mi) | 19 | DPR submitted |

## Stations

Red Line :
| S.No | Station Name | Station Name | Connections | Layout | Opened |
| S.No | English | Tamil | Connections | Layout | Opened |
| 1 | Madhavaram Milk Colony | மாதவரம் பால் பண்ணை | Purple Line | Underground | Under construction |
| 2 | Madhavaram Depot | மாதவரம் பணிமனை | | At-grade | Under construction |
| 3 | Assisi Nagar | அசிசி நகர் | | Elevated | Under construction |
| 4 | Manjambakkam | மஞ்சம்பாக்கம் | | Elevated | Under construction |
| 5 | Velmurugan Nagar | வேல்முருகன் நகர் | | Elevated | Under construction |
| 6 | Madhavaram Bus Terminus | மாதவரம் பேருந்து நிலையம் | Madhavaram Mofussil Bus Terminus | Elevated | Under construction |
| 7 | Shastri Nagar, Chennai | சாஸ்திரி நகர் | | Elevated | Under construction |
| 8 | Retteri Junction | ரெட்டேரி சந்திப்பு | | Elevated | Under construction |
| 9 | Kolathur Junction | கொளத்தூர் சந்திப்பு | | Underground | Under construction |
| 10 | Srinivasa Nagar | சீனிவாச நகர் | | Underground | Under construction |
| 11 | Villivakkam | வில்லிவாக்கம் | West Line, Chennai Suburban (Villivakkam) | Underground | Under construction |
| 12 | Villivakkam Bus Terminus | வில்லிவாக்கம் பேருந்து நிலையம் | | Underground | Under construction |
| 13 | Villivakkam MTH Road | வில்லிவாக்கம் எம்.டி.எச் சாலை | | Underground | Under construction |
| 14 | Anna Nagar West | அண்ணா நகர் மேற்கு | | Elevated | Under construction |
| 15 | Thirumangalam | திருமங்கலம் | Green Line | Elevated | 15 May 2017 |
| 16 | Anna Nagar KV | அண்ணா நகர் கே.வி | | Elevated | Under construction |
| 17 | Koyambedu | கோயம்பேடு | Green Line | Elevated | 29 June 2015 |
| 18 | Koyambedu Market | கோயம்பேடு அங்காடி | | Elevated | Under construction |
| 19 | Natesan Nagar | நடேசன் நகர் | | Elevated | Under construction |
| 20 | Virugambakkam | விருகம்பாக்கம் | | Elevated | Under construction |
| 21 | Alwarthirunagar | ஆழ்வார்திருநகர் | Orange Line | Elevated | Under construction |
| 22 | Valasaravakkam | வளசரவாக்கம் | Orange Line | Elevated | Under construction |
| 23 | Karambakkam | காரம்பாக்கம் | Orange Line | Elevated | Under construction |
| 24 | Alapakkam Junction | ஆலப்பாக்கம் சந்திப்பு | Orange Line | Elevated | Under construction |
| 25 | Mugalivakkam | முகலிவாக்கம் | | Elevated | Under construction |
| 26 | Ramapuram | ராமாபுரம் | | Elevated | Under construction |
| 27 | Manapakkam | மணப்பாக்கம் | | Elevated | Under construction |
| 28 | Chennai Trade Centre | சென்னை வர்த்தக மையம் | | Elevated | Under construction |
| 29 | Butt Road | பட் சாலை | | Elevated | Under construction |
| 30 | Alandur | ஆலந்தூர் | Blue Line Green Line | Elevated | 29 June 2015 |
| 31 | St. Thomas Mount | பரங்கிமலை | Green Line South Line, Chennai Suburban (St. Thomas Mount) Chennai MRTS (St. Thomas Mount) | Elevated | 14 October 2016 |
| 32 | Adambakkam | ஆதம்பாக்கம் | Chennai MRTS (Adambakkam) | Elevated | Under construction |
| 33 | Vanuvampet | வானுவம்பேட்டை | | Elevated | Under construction |
| 34 | Ullagaram | உள்ளகரம் | | Elevated | Under construction |
| 35 | Madipakkam | மடிப்பாக்கம் | | Elevated | Under construction |
| 36 | Kilkattalai | கீழ்க்கட்டளை | | Elevated | Under construction |
| 37 | Echangadu | ஈச்சங்காடு | | Elevated | Under construction |
| 38 | Kovilambakkam | கோவிலம்பாக்கம் | | Elevated | Under construction |
| 39 | Vellakkal | வெள்ளக்கல் | | Elevated | Under construction |
| 40 | Medavakkam I | மேடவாக்கம் I | | Elevated | Under construction |
| 41 | Medavakkam II | மேடவாக்கம் II | | Elevated | Under construction |
| 42 | Perumbakkam | பெரும்பாக்கம் | | Elevated | Under construction |
| 43 | Classical Tamil Institute | செம்மொழித் தமிழாய்வு நிறுவனம் | | Elevated | Under construction |
| 44 | Elcot | எல்காட் | | Elevated | Under construction |
| 45 | Sholinganallur | சோழிங்கநல்லூர் | Purple Line | Elevated | Under construction |
$^§$ under construction