First underground metro train in Chennai to run from Sunday | Chennai News - Times of India
London Underground map: The only six cities in the world with more Tube stations than London - MyLondon
Underground Metro Stations in Chennai connect Rail, Road and Air Travel
List of metro systems - Wikipedia
Going deeper underground: subway stations that will make you think "wow that's a really cool subway station!" | Intrepid Travel Blog - The Journal
London UK January 2021 Underground Tube Metro Train Stopped on a Platform Station in London, Doors Open with No People, UKs Editorial Image - Image of pandemic, platform: 211115590
CMRL issues four underground civil tenders for Chennai Metro Phase 2 | Urban Transport News
Learning Le Metro: Basic Tips for Paris' Underground Arteries by Rick Steves
Namma Metro: Bengaluru's Namma metro 2nd longest after Delhi metro - The Economic Times
Bids invited for construction of underground stretch of corridor-5 of Chennai Metro | Urban Transport News
Delhi Metro services briefly halted after mild tremors in national capital | Mint
Riding the UK's 2nd-Biggest Metro, Which Includes Ferry Trips: Photos
Oldest metros in Europe: London Underground to Moscow Metro
Underground Metro ideal, but not viable - Metro Rail News
Is underground transit bad for your health? - USC News
Trial Runs on Bangalore Metro's Underground Section Finally Begin - The Metro Rail Guy
Siemens Mobility to deliver the new metro trains for London's Tube | Press | Company | Siemens
Metro rail
UNDERGROUND CHENNAI METRO | Koyambedu - Nehru Park | Inauguration & First Ride | Full Coverage - YouTube
First underground metro train in Chennai to run from Sunday - The Hindu BusinessLine
List of metro systems - Wikipedia
Subway | History, Transportation, Cities, & Facts | Britannica
Namma Metro train completes journey on underground stretch | Deccan Herald
