Currently, the suburban railway services are available in Kolkata, Mumbai, Delhi, Chennai, and MMTS Hyderabad Rapid Transit The rapid transit system in India comprises the metro rail and monorail services. The Kolkata Metro is the oldest metro railway service in India which started way back in 1984. Other metro services in the country are as follows: Delhi Metro, Chennai Mass Rapid Transit System, and Namma Metro (Bengaluru). Metro railway services that are under construction include: Rapid Metro Rail Gurgaon, Mumbai Metro, Chennai Metro, Jaipur Metro, Hyderabad Metro, Navi Mumbai Metro, and Kochi Metro.