Phase II Chennai Metro Rail work under way. Image used for representational purposes | Photo Credit: B. Jothi Ramalingam The Tamil Nadu government will submit detailed project reports (DPR) of the Chennai Metro Rail lines between Airport to Kilambakkam, Koyambedu to Pattabiram via Avadi, and Poonamallee to Sunkuvarchatram via Sriperumbudur to the Union government for equity contribution, Finance Minister Thangam Thennarasu said in the Assembly on Friday (March 14, 2025). Mr. Thennarasu, while presenting the Budget 2025-26, said the Airport-Kilambakkam corridor extends for 15.46 km and its estimated cost is ₹9,335 crore. For the 21.76-km-long Koyambedu to Pattabiram via Avadi corridor, the project cost is ₹9,744 crore, whereas for the Poonamallee to Sunkuvarchatram via Sriperumbudur corridor, whose length is 27.9 km, the cost estimate stands at ₹8,779 crore. As the next step, Chennai Metro Rail will prepare a detailed project report for Tambaram to Velachery stretch via Guindy, which runs for 21 km, and for the 6-km stretch between Light House and High Court. The State government will also explore a Regional Rapid Transit System …