Rapid transit or mass rapid transit (MRT), also known as metro, subway, tube, or underground system of railways, usually electric, that is used for local transit in a metropolitan area. A rapid transit line may run underground (subway), above street level (elevated transit line), or at street level. Rapid transit is distinguished from other forms of mass transit by its operation on exclusive right-of-way, with no access for other vehicles or for pedestrians.
As per UITP (Union Internationale des Transports Publics) report, at the end of 2017 there were metros in 56 countries spanning 7 continents. While Asia have the highest number of metros among the continents, the country with the most metro systems is China, with 39 operational.
As of 2017 a total of 182 cities had metros in the world.
The London Underground first opened as an "underground railway" in 1863 and its first electrified underground line opened in 1890, making it the world's oldest metro system. The Beijing Subway is the world's busiest and longest metro system, while the New York City Subway has the greatest number of stations.
There are currently 13 operational rapid transit systems (commonly called 'metro') in 21 cities in India. As of August 2019, India has 678.52 kilometers (421.61 miles) of operational metro lines and 540 stations.
The first metro in India is the Kolkata Metro, which started operations in 1984. The Delhi Metro has the largest metro network in the entire country, connected to other nearby cities in the National Capital Region. The newest metro opened is Nagpur Metro on 8 March 2019.
Only metro system in India, fully owned & operated by Indian Railways
Serves Delhi and its satellite cities of Ghaziabad, Faridabad, Gurgaon, Noida, Bahadurgarh and Ballabhgarh, in the National Capital Region of India
First metro in southern India
A light rapid transit system, acts as a feeder link to the Delhi Metro
First metro rail in the country to connect two lines (blue & green) through loop line to run direct service
The first metro in the country which connects rail, road, and water transport facilities
The second-longest operational metro network in India and the largest Public Private Partnership metro project in the world
Connects the twin cities of Noida and Greater Noida
Built by Gujarat Metro Rail Corporation (GMRC) Limited
