The Orange Line or Line 4 is one of the three lines of Chennai Metro, Phase 2 Project . The under construction line stretches from Lighthouse to Poonamallee Bypass . The line will consist of 27 stations, out of which 9 are underground and 18 are elevated.

Phase II

E. Sreedharan, in 2013, stressed on the need of a greater expansion of Chennai metro network by undertaking subsequent phases. In July 2016, the then Chief Minister J. Jayalalithaa announced that Chennai Metro Phase 2 would be 104 km long and have 104 stations.^[1] In July 2017, in a suo motu statement in the State Legislative Assembly, an extension in Phase II, involving an extension of Line 4 from Lighthouse up to Poonamallee, with the Madhavaram–Sholinganallur and Lighthouse–Poonamallee lines intersecting at Alwarthirunagar was announced, making Phase 2 116.1 km long.^[2] The key focus for Phase 2 is to connect the northern (Madhavaram, Redhills) and southern parts (Siruseri, Sholinganallur) and the east parts of Chennai (Light house, Mylapore) to the western parts of Chennai (Porur, Poonamallee)

The present estimate for the phase 2 stands at Rs. 63,000 crore and received approval from the state government. Foundation stone for phase 2 was laid on 20 November 2020 by Union Home Minister Amit Shah and construction for the phase from Poonamallee to Power House of Line 4 commenced on 1 June 2021.^[4][5] Addressing an event in Chennai, Prime Minister Narendra Modi on Sunday 14 February 2021 said the Centre has set aside Rs 63,000 crore which is one of the largest projects sanctioned for any city in one-go.^[6] The map and list of stations for all 3 lines of Phase 2 has also been published by CMRL.

Chennai: As many as 19 elevated metro stations may connect Poonamallee in the city with the new greenfield airport planned in Parandur. On Thursday(4.01.24), Chennai Metro Rail Limited (CMRL) submitted the detailed feasibility report (DFR) to state government, recommending an elevated metrorail corridor between the two places via Thirumazhisai and Sriperumbdur over 43.63km, construction of which may cost ₹10,712 crore. The line will be an extension of phase-2 corridor from Lighthouse to Poonamallee covering 26.1km. A CMRL official said metro trains will take passengers inside the terminals at Parandur airport, proposed to be built over 4,500 acres. Passengers may also be able reach the airport quicker as there will only a few stations located every 5km or more between Poonamallee and Parandur. Some of the major locations the metro network is likely to connect with stations include Nazarathpet, Chembarambakkam, Thirumazhisai, Pappanchatiram, Chettipedu, Thandalam, Irungattukottai, Pennalur, Sriperumbudur, Sipcot, Mambakkam, Sunguvarchatiram, Neevallur and Parandur. “For the first 4km or 5km, we may have stations for every one kilometre. The total number of stations may reduce when we prepare the detailed project report,” said a CMRL official. “Once government approves the DFR, we will float tender and appoint an agent to prepare the DPR which may take around six months to get ready,” he said. A release said CMRL recommended metrorail connectivity considering the proposed new airport at Parandur, proposed bus terminus at Thirumazhisai and future growth potential along the corridor. Earlier, during the course of the feasibility study, it was assessed that there was a need for multiple stations in Parandur itself before the line terminates at the new airport because the government is planning to develop an aero city comprising a township with hotels, educational institutions, aviation ancillary units, an MRO (maintenance, repair and overhaul) hub for aircraft. The government had earlier announced a line from Poonamallee Bypass to Sriperumbudur as an extension of phase-2 corridor-4 from Lighthouse to Poonamallee Bypass (26.1km). Parandur was added after the location of the second airport was announced in August 2022 .^[7]

The stations in phase II will be smaller at 300 m (980 ft) compared with 220 m (720 ft) in phase I. Phase II will have three depots, namely, Madhavaram (30 hectares), SIPCOT (10 ha [25 acres]), and Poonamallee (20 ha [49 acres]).^[8]

Chennai Metro
Phase II (Line 4)
Lighthouse Kutchery Road Thirumayilai Alwarpet Bharathidasan Road Boat Club Nandanam Panagal Park Kodambakkam Kodambakkam Power House Vadapalani Saligramam Saligramam Ware House Alwarthiru Nagar Valasaravakkam Karambakkam Alapakkam Porur Junction Porur Bypass Thelliyaragaram Iyyapanthangal Kattupakkam Kumananchavadi Karayanchavadi Mullaithottam Poonamallee Poonamallee Depot Poonamallee Bypass Nazarathpet Thirumazhisai Chembarambakkam Kuthambakkam Pappanchatiram Chettipedu Thandalam Irungattukottai Pennalur Sriperumbudur Sipcot Mambakkam Sunguvarchatiram Neervalur Parandur

Stations

Orange Line
S.No	Station Name		Connections	Layout	Opened
	English	Tamil
1	Lighthouse	கலங்கரை விளக்கம்	None	Underground	UC
2	Kutchery Road	கச்சேரி சாலை	None	Underground	UC
3	Thirumayilai	திருமயிலை	Thirumayilai railway station,   Purple Line	Underground	UC
4	Alwarpet	ஆழ்வார்பேட்டை	None	Underground	UC
5	Bharathidasan Road	பாரதிதாசன் சாலை	None	Underground	UC
6	Boat Club	படகு குழாம்	None	Underground	UC
7	Nandanam	நந்தனம்	Blue Line	Underground	25 May 2018
8	Panagal Park	பனகல் பூங்கா	None	Underground	UC
9	Kodambakkam	கோடம்பாக்கம்	Kodambakkam railway station	Underground	UC
10	Kodambakkam Power House	கோடம்பாக்கம் பவர் ஹவுஸ்	None	Elevated	UC
11	Vadapalani	வடபழனி	Green Line	Elevated	UC
12	Saligramam	சாலிகிராமம்	None	Elevated	UC
13	Saligramam Ware House	சாலிகிராமம் கிடங்கு	None	Elevated	UC
14	Alwarthiru Nagar	ஆழ்வார்திருநகர்	Red Line	Elevated	UC
15	Valasaravakkam	வளசரவாக்கம்	Red Line	Elevated	UC
16	Karambakkam	காரம்பாக்கம்	Red Line	Elevated	UC
17	Alapakkam	ஆலப்பாக்கம்	Red Line	Elevated	UC
18	Porur Junction	போரூர் சந்திப்பு	None	Elevated	UC
19	Porur Bypass	போரூர் புறவழிச்சாலை	None	Elevated	UC
20	Thelliyaragaram	தெள்ளியார் அகரம்	None	Elevated	UC
21	Iyyapanthangal	ஐயப்பன்தாங்கல்	Bus Depot	Elevated	UC
22	Kattupakkam	காட்டுப்பாக்கம்	None	Elevated	UC
23	Kumananchavadi	குமணன்சாவடி	None	Elevated	UC
24	Karayanchavadi	கரையான்சாவடி	None	Elevated	UC
25	Mullaithottam	முல்லைத்தோட்டம்	None	Elevated	UC
26	Poonamallee	பூவிருந்தவல்லி	Bus Terminus	Elevated	UC
27	Poonamallee Depot	பூவிருந்தவல்லி டிப்போ	None	Elevated	UC
28	Poonamallee Bypass	பூவிருந்தவல்லி புறவழிச்சாலை	None	Elevated	UC
NA	Nazarathpet	நசரத்பேட்டை	None	Elevated	Phase 2 extension
NA	Thirumazhisai	திருமழிசை	None	Elevated	Phase 2 extension
NA	Chembarambakkam	செம்பரம்பாக்கம்	None	Elevated	Phase 2 extension
NA	Kuthambakkam	குத்தம்பாக்கம்	Bus Terminus	Elevated	Phase 2 extension
NA	Pappanchatiram	பாப்பன்சத்திரம்	None	Elevated	Phase 2 extension
NA	Chettipedu	செட்டிபேடு	None	Elevated	Phase 2 extension
NA	Thandalam	தண்டலம்	None	Elevated	Phase 2 extension
NA	Irungattukottai	இருங்காட்டுகோட்டை	None	Elevated	Phase 2 extension
NA	Pennalur	பென்னலூர்	None	Elevated	Phase 2 extension
NA	Sriperumbudur	திருபெரும்புதூர்	None	Elevated	Phase 2 extension
NA	Sipcot	சிப்காட்	None	Elevated	Phase 2 extension
NA	Mambakkam	மாம்பாக்கம்	None	Elevated	Phase 2 extension
NA	Sunguvarchatiram	சுங்குவார்சத்திரம்	None	Elevated	Phase 2 extension
NA	Neervalur	நீர்வளூர்	None	Elevated	Phase 2 extension
NA	Parandur	பரந்தூர்	Chennai Greenfield Airport	Elevated	Phase 2 extension

Removed and Renamed Stations

References