Grey Line uses 1,435 mm (4 ft 8+1⁄2 in) standard gauge tracks, while the Blue Line was built with wider bg tracks.

The line uses the same rolling stock used on Pink and Magenta lines, although no Platform Screen Doors (PSDs) have been installed due to low ridership projections.

[2] The Dwarka to Najafgarh section was opened to the public on 4 October 2019.

[3] A further extension to Dhansa Bus Stand was scheduled to open in December 2020, but construction was delayed by the COVID-19 pandemic.

However, when the construction work began on-ground, some of the private land could not be acquired for the project.