# Line 3 (Chennai Metro)

The Purple Line or Line 3 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 Siruseri SIPCOT. The 45.4 km (28.2 mi) long line will consist of 47 stations, out of which 28 will be underground and 19 will be at grade or elevated.

## 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 third line connecting Madhavaram Milk Colony and Siruseri SIPCOT will extend to 45.8 km (28.5 mi) of which 19.1 km (11.9 mi) would be elevated and 26.7 km (16.6 mi) underground. It will consist of 50 stations including 30 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 third line to 47. 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 |
| Purple Line | Madhavaram | Siruseri | 45.4 | 46 | Under construction |
The second phase is estimated to cost ₹63,246 crore (US$7.2 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$7.2 billion) for the construction of phase II and further extension.

### Phase II extension

In 2022, the state government proposed an extension plan for the third line from Siruseri to Kilambakkam, covering an approximate 25 km (16 mi). In September 2023, feasibility report was submitted by CMRL for the proposed expansion of the line, green lighting the same. The extension was scrapped due to patronage and profitability concerns.
Chennai Metro - Phase II Extension :
| Line | Terminals | Terminals | Length | Stations | Status |
| Purple Line | Siruseri | Kilambakkam | 25 km (16 mi) | TBD | DFR submitted; Proposal dropped |

## Tendering

Purple Line (Line 3) :
| Civil Work ||||||
| Tendering | Section | Section | Successful Bid /Cost | Contractor | Award |
| Elevated Viaduct and StationWork ||||||
| CP08/EV-01/RT-01 | Nehru Nagar – Sholinganallur | Nehru Nagar – Sholinganallur | ₹963.00 crore (US$110 million) | L&T | June 15 2023 |
| C3-ECV-01/RT-01 | Sholinganallur – SIPCOT 2 | Sholinganallur – SIPCOT 2 | ₹901.15 crore (US$100 million) | RVNL | Jan 21 2023 |
| Underground Tunneling ||||||
| TU-01 | Venugopal Nagar – Kellys | Venugopal Nagar – Kellys | ₹1,999.00 crore (US$230 million) | Tata Projects | May 12 2021 |
| TU-02 | Kellys – Taramani Road | Kellys – Taramani Road | ₹2,385.00 crore (US$270 million) | L&T | May 12 2021 |
| Underground Station Work ||||||
| UG-1-RT01 | Madhavaram – Perambur | Madhavaram – Perambur | ₹792.00 crore (US$91 million) | DRA – Soma JV | June 15 2023 |
| UG-2-RT01 | Ayanavaram – Kellys | Ayanavaram – Kellys | ₹929.62 crore (US$110 million) | Tata Projects | June 15 2023 |
| UG-3-RT01 | KMC – Royapettah | KMC – Royapettah | ₹1,328.89 crore (US$150 million) | RVNL | June 15 2023 |
| UG-4-RT01 | Radhakrishnan – Adyar Junction | Radhakrishnan – Adyar Junction | ₹1,151.41 crore (US$130 million) | RVNL | June 15 2023 |
| UG-5-RT01 | Adyar Depot – Taramani Link Road | Adyar Depot – Taramani Link Road | ₹665.99 crore (US$76 million) | RVNL | June 15 2023 |
| Civil Work Cost | Civil Work Cost | Civil Work Cost | ₹11,116.06 crore (US$1.3 billion) | | |
| Miscellaneous ||||||
| Tendering | Contract | Section | Successful Bid /Cost | Contractor | Award |
| BC-3,5/TRK-02 | Track Work | Sholinganallur – SIPCOT 2 | ₹81.83 crore (US$9.4 million) | L&T | Jul 29 2022 |
| CORR-3/CP18A-ATW-09/2022 | Track Work | Madhavaram Milk Colony – Sholinganallur | ₹299.46 crore (US$34 million) | L&T | Dec 12 2022 |
| CP19/HHRAILS/2021 | Head-Hardened Rails | Head-Hardened Rails | ₹82.38 crore (US$9.4 million) | Mitsui & Co | Jan 11 2023 |
| SYS/C3&5/PS&OHE-10/2021 | RSS, ASS and SCADA | Sholinganallur – SIPCOT 2 | ₹87.03 crore (US$10 million) | Linxon India | Jan 10 2023 |
| PHASE-II/CP20.1-PS-06/2021 | RSS, ASS and SCADA | Madhavaram Milk Colony – Sholinganallur | ₹366.53 crore (US$42 million) | L&T | May 24 2023 |
| PHASE-II/CP20.2-OHE-07/2021 | OHE | Madhavaram Milk Colony – Sholinganallur | ₹164.34 crore (US$19 million) | L&T | May 24 2023 |
| To Be Awarded | OHE | Sholinganallur – SIPCOT 2 | To Be Awarded | To Be Awarded | To Be Awarded |
| ASA-04 | Signalling and Train Control and Video Management Systems | Signalling and Train Control and Video Management Systems | ₹1,620.00 crore (US$190 million) | Hitachi Rail | Mar 15 2023 |
| ASA-07 | Telecom Contract | Telecom Contract | ₹45.37 crore (US$5.2 million) | Consort Digital | Fev 09 2023 |
| Miscellaneous Cost | Miscellaneous Cost | Miscellaneous Cost | ₹2,746.94 crore (US$310 million) | | |
| Total Cost | Total Cost | Total Cost | ₹13,863.00 crore (US$1.6 billion) | | |

## Stations

Purple Line :
| S.No | Station Name | Station Name | Connections | Station Layour | Expected Opening |
| S.No | English | Tamil | Connections | Station Layour | Expected Opening |
| 1 | Madhavaram Milk Colony | மாதவரம் பால் பண்ணை | Red Line | Underground | 2028 |
| 2 | Madhavaram High Road | மாதவரம் நெடுஞ்சாலை | | Underground | 2028 |
| 3 | Moolakadai | மூலக்கடை | | Underground | 2028 |
| 4 | Sembiyam | செம்பியம் | | Underground | 2028 |
| 5 | Perambur Market | பெரம்பூர் அங்காடி | | Underground | 2028 |
| 6 | Perambur | பெரம்பூர் | West Line, Chennai Suburban (Perambur) | Underground | 2028 |
| 7 | Ayanavaram | அயனாவரம் | Ayanavaram MTC Bus Depot | Underground | 2028 |
| 8 | Otteri | ஓட்டேரி | | Underground | 2028 |
| 9 | Pattalam | பட்டாளம் | | Underground | 2028 |
| 10 | Perambur Barracks Road | பெரம்பூர் பேரக்ஸ் சாலை | | Underground | 2028 |
| 11 | Purasaiwakkam | புரசைவாக்கம் | | Underground | 2028 |
| 12 | Kellys | கெல்லீஸ் | | Underground | 2028 |
| 13 | Kilpauk | கீழ்ப்பாக்கம் | Green Line | Underground | 2028 |
| 14 | Chetpet | சேத்துப்பட்டு | South Line, Chennai Suburban (Chetpet) | Underground | 2028 |
| 15 | Sterling Road | ஸ்டெர்லிங் சாலை | | Underground | 2028 |
| 16 | Nungambakkam | நுங்கம்பாக்கம் | | Underground | 2028 |
| 17 | Anna Flyover | அண்ணா மேம்பாலம் | | Underground | 2028 |
| 18 | Thousand Lights | ஆயிரம் விளக்கு | Blue Line | Underground | 2028 |
| 19 | Royapettah | ராயப்பேட்டை | | Underground | 2028 |
| 20 | Dr. Radhakrishnan Salai | டாக்டர் ராதாகிருஷ்ணன் சாலை | | Underground | 2028 |
| 21 | Thirumayilai | திருமயிலை | Chennai MRTS (Thirumayilai) Orange Line | Underground | 2028 |
| 22 | Mandaiveli | மந்தைவெளி | Chennai MRTS (Mandaveli) | Underground | 2028 |
| 23 | Greenways Road | பசுமைவழிச் சாலை | Chennai MRTS (Greenways Road) | Underground | 2028 |
| 24 | Adyar Junction | அடையாறு சந்திப்பு | | Underground | 2028 |
| 25 | Adyar Depot | அடையாறு பணிமனை | | Underground | 2028 |
| 26 | Indira Nagar | இந்திரா நகர் | Chennai MRTS (Indira Nagar) | Underground | 2028 |
| 27 | Thiruvanmiyur | திருவான்மியூர் | Chennai MRTS (Thiruvanmiyur) | Underground | 2028 |
| 28 | Taramani | தரமணி | Chennai MRTS (Taramani) | Underground | 2028 |
| 29 | Nehru Nagar | நேரு நகர் | | Elevated | 2028 |
| 30 | Kandanchavadi | கந்தன்சாவடி | | Elevated | 2028 |
| 31 | Perungudi | பெருங்குடி | | Elevated | 2028 |
| 32 | Thoraipakkam | துரைப்பாக்கம் | | Elevated | 2028 |
| 33 | Mettukuppam | மேட்டுக்குப்பம் | | Elevated | 2028 |
| 34 | PTC Colony | பி.டி.சி. காலனி | | Elevated | 2028 |
| 35 | Okkiyampet | ஒக்கியம்பேட்டை | | Elevated | 2028 |
| 36 | Karapakkam | காரப்பாக்கம் | | Elevated | 2028 |
| 37 | Okkiyam Thoraipakkam | ஒக்கியம் துரைப்பாக்கம் | | Elevated | 2028 |
| 38 | Sholinganallur | சோழிங்கநல்லூர் | Red Line | Elevated | 2028 |
| 39 | Sholinganallur Lake I | சோழிங்கநல்லூர் ஏரி I | | Elevated | 2028 |
| 40 | Sholinganallur Lake II | சோழிங்கநல்லூர் ஏரி II | | Elevated | 2028 |
| 41 | Nookampalayam Depot | நூகம்பாளையம் பணிமனை | | Elevated | 2028 |
| 42 | Semmancheri I | செம்மஞ்சேரி I | | Elevated | 2028 |
| 43 | Semmancheri I | செம்மஞ்சேரி II | | Elevated | 2028 |
| 44 | Gandhi Nagar | காந்தி நகர் | | Elevated | 2028 |
| 45 | Navallur | நாவலூர் | | Elevated | 2028 |
| 46 | Siruseri | சிறுசேரி | | Elevated | 2028 |
| 47 | SIPCOT 1 | சிப்காட் 1 | | Elevated | 2028 |
| 48 | SIPCOT 2 | சிப்காட் 2 | | Elevated | 2028 |
$^§$ under construction