On 6 August 2012, in a step that will improve commuting in National Capital Region, the Union government approved the extension of Delhi Metro from Mundka to Bahadurgarh in Haryana.

The 11.18 km (6.95 mi) metro stretch comprises seven stations with four of them in Delhi and the remaining three in Bahadurgarh -- Mundka Industrial Area, Ghevra, Tikri Kalan, Tikri Border, Pandit Shree Ram Sharma (Modern Industrial Estate), Bahadurgarh City (Bus Stand) and Brigadier Hoshiar Singh (City Park).

[5] Construction began in that year itself and the new halt platform of Green Line, named Punjabi Bagh West, was thrown open to the public on 29 March 2022, after multiple delays.

Construction is expected to begin in 2024, as part of the fourth phase of the Delhi Metro's development, and is slated to be completed by 2029.

[3] The Green Line uses standard gauge trains manufactured by a consortium of Mitsubishi, Hyundai Rotem and Bharat Earth Movers (BEML).