The line connects the north western cities of Bangalore such as Madavara, Jalahalli, Peenya, Yeshwanthpur (along Tumakuru Road), Rajajinagar, Malleshwaram with the central hub of Majestic and the southern residential areas of Bangalore such as Basavanagudi, Jayanagar, Banashankari, Konanakunte Cross, Thalaghattapura along Kanakapura Road.

After Phase II was completed, the line extended its stretch from Madavara in northwest to Silk Institute in the South.

TBMs named Kaveri, Krishna and Godavari were used for tunnel boring work for the Green Line.

The total roofing area of the 10 stations on the stretch was 47,000 square metres (510,000 sq ft).

[26] BMRCL Managing Director Pradeep Singh Kharola stated that about 25,000 passengers traveled on the line on the opening day.

[28] TBM Godavari began drilling the 970-metre (3,180 ft) underground section between Sampige Road and Majestic stations in April 2014.

Godavari completed drilling and emerged on the Majestic station end of the tunnel on 19 April 2016.

[29][30] Meanwhile, Kaveri and Krishna continued drilling the underground section between National College and Nadaprabhu Kempegowda station.

Construction of the underground section of Green Line required the use of 3,000 transit mixer loads of concrete.

[31] Trial runs on the elevated section between National College and Yelachenahalli began on 23 November 2016.

The BMTC introduced special feeder bus services to transport passengers from Rajajinagara to Hosahalli.

Trial runs were conducted on 18–19 December 2020[40] following which the extension was inaugurated on 14 January 2021,[41] making it the first section of Phase II to start commercial operations.

In October 2016, BMRCL invited bids for the construction of viaduct and stations on the 3.031 km extension (Reach 3C) of the Green Line from Nagasandra to Madavara (previously named Bengaluru International Exhibition Centre).

There have been petitions to extend the line south until the Art of Living International Centre in the outskirts of Bengaluru.

Passenger interchange facilities, connecting to other metro and railway lines, will be provided at the following stations: ಚಿಕ್ಕಬಿದರಕಲ್ಲು Yesvantpur Junction Mallige  (Under Construction) Sampige  (Under Construction) KSR Bangalore City Jn Kempegowda Bus Station BMRC procured 150 metro coaches for fifty 3-car train sets in DMC-TC-DMC formation for Phase l of Namma Metro from BEML-Hyundai Rotem at a cost of Rs 1,672.50 crore (Rs 16.72 billion).

It includes the Urbalis 200 Automatic Train Control system which will ensure optimal safety, flexible operations and heightened passenger comfort.

The integrated control centre at Baiyyappanahalli has direct communication with trains and stations are CCTV fitted with visual and audio service information.