Delhi Metro

The Delhi Metro is a mass rapid transit (MRT) system serving Delhi and its adjoining satellite cities such as Ghaziabad, Faridabad, Gurugram, Noida and Bahadurgarh, in the National Capital Region of India. The Delhi Metro network consists of 10 colour-coded lines serving 256 stations with a total length of . It is the largest and busiest metro rail system in India, and the second oldest after the Kolkata Metro. The system has a mix of underground, at-grade, and elevated stations using both broad-gauge and standard-gauge tracks. The Delhi Metro operates over 4,300 trips daily. The construction of the Delhi Metro started in 1998, and the first elevated section (Shahdara to Tis Hazari) on the Red Line opened on 25 December 2002. The first underground section (Vishwa Vidyalaya – Kashmere Gate) on the Yellow Line opened on 20 December 2004. The development of the network was divided into phases. Phase I with 3 lines was completed by 2006, and Phase II in 2011. Phase III was mostly complete in 2021, except a small extension of the Airport line which was opened in 2023. Construction under Phase IV was formally started on 30 December 2019. Delhi Metro Rail Corporation Limited (DMRC), a company with equal equity participation from the Government of India and the Government of Delhi, built and operates the Delhi Metro. DMRC was certified by the United Nations in 2011 as the first metro rail and rail-based system in the world to get carbon credits for reducing greenhouse gas emissions, reducing carbon emission levels in the city by 630,000 tonnes every year.