| Green Line | |
|---|---|
 A metro train on the Green line entering Koyambedu station | |
| Overview | |
| Other name | Chennai Central - St. Thomas Mount Line |
| Native name | பச்சை வழித்தடம் (Pacchai vaḻittaṭam) |
| Status | Operational |
| Locale | Chennai |
| Termini | |
| Connecting lines | Operational (5): Blue Line Chennai MRTS , Chennai Suburban West Line , Chennai Suburban South Line , Chennai Suburban South West Line Upcoming (3): Purple LineRed LineYellow Line |
| Stations | 17 |
| Service | |
| Type | Rapid transit |
| System | Chennai Metro |
| Operator(s) | Chennai Metro Rail Limited |
| Depot(s) | Koyambedu |
| Rolling stock | Alstom |
| History | |
| Opened | 25 September 2015; 10 years ago (2015-09-25) |
| Technical | |
| Line length | 22 km (14 mi) |
| Number of tracks | 2 |
| Character | 9.7 km (6.0 mi) Underground 12.3 km (7.6 mi) Elevated |
| Track gauge | 1,435 mm (4 ft 8+1⁄2 in)standard gauge |
| Electrification | 25 kV 50 Hz ACoverhead catenary |
| Operating speed | 80 km/h (50 mph) |
TheGreen Line is one of the two operational lines ofChennai Metro apart from theBlue line in the city of Chennai. The line stretches fromChennai Central toSt. Thomas Mount, covering a distance of 22 km (14 mi). The line consists of 17stations out of which nine stations are underground and the rest areelevated or on ground level.
Planning for the metro started in 2007-08 with the construction commencing in February 2009. Testing began in 2014, and the Commissioner of Metro Rail Safety approved the operations in January 2015. On 29 June 2015, commercial operations started betweenAlandur andKoyambedu stations on the green line with the first underground section betweenThirumangalam toNehru Park operational on 14 May 2017, which was later extended to Chennai Central on 25 May 2018.
In 2006, a modern metro rail system was planned forChennai modeled after theDelhi Metro.[1][2]Delhi Metro Rail Corporation (DMRC) was tasked with preparing a detailed project report on the implementation of the metro system in Chennai.[2] Based on the report, theGovernment of Tamil Nadu approved the first phase of the project in November 2007.[3] The first phase was planned with two lines covering 45.1 km (28.0 mi) with 25 km (15.5 mi) being underground. The first corridor would connectWashermanpet withChennai International Airport extending for 23.1 km (14.4 mi) with 14.3 km (8.9 mi) being underground.[2] In December 2007,Chennai Metro Rail Limited (CMRL) was incorporated and theGovernment of India gave approval for the project in January 2009.[4][3]
In February 2009, a₹199 crore (US$24 million) contract was awarded for the construction of a 4.5 km (2.80 mi) long viaduct along theInner Ring Road betweenKoyambedu andAshok Nagar.[5] The construction started on 10 June 2009.[6] In August 2010, the contract for supplyingrolling stock was awarded toAlstom.[7][8] In January 2011, a joint venture betweenLarsen and Toubro andAlstom was awarded the contract for design and construction of track works and a depot at Koyambedu for₹449.22 crore (US$53 million).[9][10]
On 14 February 2014, the maiden trial run was conducted betweenKoyambedu andAshok Nagar stations.[11][12] In August 2014, the metro received the statutory speed certification clearance from theResearch Design and Standards Organisation.[13][14] In January 2015, a report was submitted to the Commissioner of Metro Rail Safety for approval.[15] In April 2015, the Commissioner of Metro Rail Safety inspected the rolling stock and submitted the report to the Railway Board.[16][17][18]
On 29 June 2015, commercial operations started betweenAlandur and Koyambedu stations on the green line.[19] On 14 May 2017, operations commenced in the first underground line betweenThirumangalam toNehru Park on the green line, which was extended toChennai central on 25 May 2018.[20]
| Line Name | Terminals | Stations | Opened | Map | |
|---|---|---|---|---|---|
| Green Line | Koyambedu | Alandur | 7 | 29 June 2015 |  |
| Alandur | St. Thomas Mount | 1 | 14 October 2016 | ||
| Koyambedu | Nehru Park | 7 | 15 May 2017 | ||
| Nehru Park | Central | 2 | 25 May 2018 | ||
The trains are operated on1,435 mm (4 ft 8+1⁄2 in)standard gauge double-tracked lines.[21] The average speed of operation is 85 kilometres per hour (53 mph) and maximum speed is 120 kilometres per hour (75 mph).[22] Alstom supplies the rolling stock for the trains operated on the line.[23] The trains are air-conditioned with electrically operated automatic sliding doors and have a first-class compartment with a dedicated section reserved for women.[24] The trains operate on25 kV ACtractioncatenary system.[25] The trains are connected to the grid via overhead electric cables and are equipped with regenerative braking with a capacity to recover 30–35% of the energy during braking.[26] The electricity is supplied byTamil Nadu Electricity Board.[27]
A total of 26 stations are operational along the blue line with 13 underground stations. In the underground sections, a walkway runs along the length with cross passages every 250 metres (820 ft 3 in) for the maintenance and emergency evacuation.[28] The underground stations have an average width of 200 metres (656 ft 2 in) and average depth of 20 feet (6.1 m) from the ground level.[29] The length of the stations in Phase 1 extension is 180 metres (590 ft 7 in).[30][31] The elevated stations have three levels with the concourse level at a minimum height of 5.5 metres (18 ft 1 in) above the ground level and platform level above the concourse while the underground stations have two levels withplatform screen doors.[32] The stations are air-conditioned and are equipped to be disabled and elderly friendly, with automatic fare collection system, announcement system, electronic display boards, escalators and lifts.[33] Paid parking facilities are available for two wheelers in most stations and four wheelers in select stations.[34]
The line connects the central and the southwest ends of the city. The stations include:
| Green Line | ||||||
|---|---|---|---|---|---|---|
| S.No | Station name[35][36] | Opened | Connections | Station layout | Platform Level Type | |
| English | Tamil | |||||
| 1 | Central | சென்ட்ரல் | 25 May 2018 | Blue Line  Chennai CentralSouth Line, Chennai Suburban (Park)West Line, Chennai Suburban (Moore Market)Chennai MRTS (Park Town) | Underground | Island |
| 2 | Egmore | எழும்பூர் | 25 May 2018 | Chennai Egmore | Underground | Island |
| 3 | Nehru Park | நேரு பூங்கா | 15 May 2017 | Underground | Island | |
| 4 | Kilpauk | கீழ்ப்பாக்கம் | 15 May 2017 | Purple Line (Under Construction) | Underground | Island |
| 5 | Pachaiyappa's College | பச்சையப்பன் கல்லூரி | 15 May 2017 | Underground | Island | |
| 6 | Shenoy Nagar | செனாய் நகர் | 15 May 2017 | Underground | Island | |
| 7 | Anna Nagar East | அண்ணா நகர் கிழக்கு | 15 May 2017 | Underground | Island | |
| 8 | Anna Nagar Tower | அண்ணா நகர் கோபுரம் | 15 May 2017 | Underground | Island | |
| 9 | Thirumangalam | திருமங்கலம் | 15 May 2017 | Red Line (Under Construction) | Underground | Island |
| 10 | Koyambedu | கோயம்பேடு | 29 June 2015 | Red Line (Under Construction) | Elevated | Side |
| 11 | Koyambedu Depot | கோயம்பேடு பணிமனை | 29 June 2015 | Elevated | Side | |
| 12 | CMBT | சென்னை புறநகர் பேருந்து நிலையம் | 29 June 2015 |  Chennai Mofussil Bus Terminus | Elevated | Side |
| 13 | Arumbakkam | அரும்பாக்கம் | 29 June 2015 | Elevated | Side | |
| 14 | Vadapalani | வடபழனி | 29 June 2015 | Yellow Line (Under Construction) | Elevated | Side |
| 15 | Ashok Nagar | அசோக் நகர் | 29 June 2015 | Elevated | Side | |
| 16 | Ekkattuthangal | ஈக்காட்டுத்தாங்கல் | 29 June 2015 | Elevated | Side | |
| 17 | Alandur | ஆலந்தூர் | 29 June 2015 | Blue Line Red Line (Under Construction) | Elevated | Side |
| 18 | St. Thomas Mount | பரங்கிமலை | 14 October 2016 | Red Line (Under Construction)South Line, Chennai Suburban (St. Thomas Mount)Chennai MRTS (St. Thomas Mount)[§] | Elevated | Side |
§ under construction
As of 2022[update], the metro operates trains from 5 AM to 11 PM with an average frequency of one train every 5 minutes in peak hours and every 8 minutes in lean hours in the green line.[37][38] The main operational control center (OCC) is located in Koyambedu where the movement of trains and real-time CCTV footage obtained is monitored.[39] Chennai Metro maintains a major depot atKoyambedu covering an area of 26 ha (64 acres) which houses maintenance workshops, stabling lines, test tracks and a washing plant for the trains.[40][41] The minimum fare is₹10 and the maximum fare is₹50.[42][43] There are six types of tickets issued by CMRL for travel in Chennai Metro.[44]
 | ||
Depot(s) |
| |
See also | ||
Bold represents terminal station on the respective main or branch line | ||
| Organisations |
| ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air |
| ||||||||||||||||||||
| Rail |
| ||||||||||||||||||||
| Road |
| ||||||||||||||||||||
| Water | |||||||||||||||||||||
