Phase I & II The Red Line was the first line of the Delhi Metro to be constructed and opened. The Tis Hazari – Shahdara section of the line was inaugurated by the then Prime Minister of India,
Shri. Atal Bihari Vajpayee, on 25 December 2002 and opened to the public on the same day. Subsequent sections opened between Tis Hazari – Inderlok on 3 October 2003, Inderlok – Rithala on 31 March 2004 and Shahdara – Dilshad Garden on 4 June 2008.
Phase III As part of the Phase III of Delhi Metro, an eastward extension of from Dilshad Garden to
Ghaziabad ISBT (New Bus Adda) was approved by DMRC and
MoHUA in January 2014. Construction began in early 2015 and commercial operations started on 8 March 2019, thereby providing commuters another link to travel to Ghaziabad along with the Blue Line branch that connects to Kaushambi and Vaishali. In November 2022, Delhi Metro introduced a set of two eight-coach trains on the Red Line, which were converted from the existing fleet of 39 six-coach trains. By April 2024, all the six-coach trains had been converted to 8-coach ones.
Phase IV Under
Phase IV of
Delhi Metro, the Red Line will be extended to
Kundli, with 21 new stations at Rohini Sector 25, Rohini Sector 26, Rohini Sector 31, Rohini Sector 32, Rohini Sector 36, Barwala, Rohini Sector 35, Rohini Sector 34, Bawana Industrial Area - 1 Sector 3,4, Bawana Industrial Area - 1 Sector 1,2, Bawana JJ Colony, Sanoth, New Sanoth, Depot Station, Bhorgarh Village, Anaj Mandi Narela,
Narela DDA Sports Complex, Narela, Narela Sector 5, Kundli and Nathpur. All these stations will be elevated, except Depot Station, which would be at-grade. The cost of this project is expected to be , and approval for it was provided by the
Union Cabinet in December 2024.
Phase V In
Phase-V, the Red Line is proposed to be extended from
Shaheed Sthal (New Bus Adda) metro station to
Ghaziabad Junction. This would be long elevated corridor with 1 new station. ==List of stations==