The Centre had given its final approval to all the six proposed corridors in December 2018. But it only approved three priority corridors in February 2019. While work on all three corridors — Janakpuri West-RK Ashram (28.9km), Aerocity-Tughlaqabad (20.2km) and Maujpur-Majlis Park (12.5km) — is going on simultaneously, the Maujpur-Majlis Park corridor, is expected to be completed first. In the fourth phase of the metro, three interchange stations will come up as part of the first corridor work — Madhuban Chowk (Red Line), Peeragarhi (Green Line), and Haiderpur Badli Mor (Yellow Line). Additionally, the corridor of Janakpuri West-R K Ashram Marg will have three more interchange facilities at Azadpur (Yellow Line), Majlis Park (Pink Line) and R K Ashram Marg (Blue Line).
