The Delhi Metro is a rapid transit system which serves Delhi and its adjoining satellite cities of Ghaziabad, Faridabad, Gurugram, Noida and Bahadurgarh in the National Capital Region of India. The system consists of 10 colour-coded lines serving 256 stations, with a total length of 350.42 kilometres (217.74 mi). It is India's largest and busiest metro rail system and the second-oldest, after the ... Wikipedia