Chennai Metro Phase 2 project 4K with 3 new lines totaling 116 km | Phase 2 Detailed Project

Phase 2 Information
Chennai Metro Phase 2 project with 3 new lines totaling 116.1 km was approved by the Tamil Nadu government in 2019 at an estimated cost of Rs. 69,180 crore. Since then, the cost has been revised down to Rs 61,843 crore by reducing station sizes. The Central Government’s approval is currently pending.
Phase 2’s Detailed Project Report (DPR) was prepared by RITES and finalized in December 2018. Out of 116.1 km, 52.01 km of Line-3’s section between Madhavaram - Sholinganallur and Line-5’s section between Madhavaram - CMBT will be built on priority and partially funded by the Japan International Cooperation Agency (JICA) through an ODA loan.
Tendering for this mostly underground phase began in January 2020.
Chennai Metro Phase 2 is expected to be completed and opened in phases from 2026 onwards. After phase 2 is built and completed in 2030 (estimated), Chennai’s metro network will become roughly 173 km long.
CMRL’s Phase 2 Deadline: December 2025
My Completion Estimate: June 2030
Phase 2 Routes
This phase involves the construction of 3 new lines on standard gauge tracks, with smaller stations than those built in Phase 1. Official alignment and line colors are yet to be announced/revealed for these 3 new lines.
Line-3 (Purple Line): Madhavaram - SIPCOT 2
Length: 45.4 km (19 km elevated & 26.4 km underground)
Depot: Madhavaram & SIPCOT
Number of Stations: 49 (20 elevated & 29 underground)
Station Names: Madhavaram Milk Colony, Thapalpetti, Murari Hospital, Moolakadai, Sembiyam, Permabur Market, Perambur Metro, Ayanavaram Otteri, Pattalam, Perambur Barracks Road, Doveton Junction (canceled), Purasawalkam High Road, Kellys, KMC, Chetpet Metro, Sterling Road Junction, Nungambakkam, Gemini, Thousand Lights, Royapettah Govt Hospital, Radhakrishnan Salai Jn, Thirumayilai Metro (interchange with Line-4), Mandaiveli, Greenways Road Metro, Adyar Jn, Adyar Depot, Indira Nagar, Thiruvanmiyur Metro, Taramani Road Junction, Nehru Nagar, Kandanchavadi, Perungudi, Thoraipakkam, Mettukuppam, PTC Colony, Okkiyampet, Karapakkam, Okkiyam Thoraipakkam, Sholinganallur (interchange with Line-5), Sholinganallur Lake, Ponniamman Temple, Sathyabama University, St Joseph College, Semmancheri, Gandhi Nagar, Navallur, Siruseri, SIPCOT 1 and SIPCOT 2
Line-4 (Orange Line): Light House - Poonamallee Bus Depot