There are 13 Metro railway system and services (or rapid transit system) operational in India.
These are Kolkata, Delhi, Bengaluru (Namma), Gurugram (Rapid Metro), Mumbai, Jaipur, Chennai, Kochi, Lucknow, Hyderabad, Noida, Ahmedabad, and Nagpur. The metro systems in all these cities of India are not operated by the Indian Railways, except for Kolkata metro, which has its own zone within the Indian Railways.
The Kolkata Metro rail is the oldest metro service in the country. Established in 1984, Kolkata Metro is currently covering a total distance of 33.02 kilometres and is serving 30 stations. The Delhi Metro, which began operations in 2002, is the largest in the country by the distance covered. Currently, the Delhi Metro is covering a distance of 389 kilometres and, has 285 stations in operations (including NOIDA-Greater NOIDA Corridor and Rapid Metro, Gurugram, whose operations it has currently taken over). The Namma Metro which serves the city of Bengaluru became operational in 2011. It covers a distance of 42.3 kilometres and has 40 stations. Nagpur metro opened on 8 March 2019, is the newest metro system in India. The other metro systems are also covering a particular stretch and in the times to come will see the addition of more tracks.
Day by day, the metro railway system is expanding, and it is being developed with the best services in India. Most of the commute routes in the populated cities of India are congested, creating a big problem for the commuters but, with the help of the metro system, these problems are being solved, by providing better ways to reach office, home, and so many more destinations. There are several cities in India where the metro system is under construction. As of September 2020, these cities are Agra, Kanpur, Bhopal, Indore, Navi Mumbai, Pune, and Patna.
The metro rail has become the most affordable and convenient mode of travel. As the metro rail is connected to the major railway stations and airports in a city, reaching them for travelling has become affordable and efficient. Metro rail is providing good connectivity in the congested cities of India, and its success has made a case for setting up the metro rail in other cities where there is a large urban population and traffic congestion. Some cities where the metro rail is in the planning stage are Dehradun, Calicut, Thiruvananthapuram, Surat, Srinagar, Jammu, Meerut, Guwahati, Gorakhpur, Visakhapatnam, and Vijayawada.