A short history of world metro systems – in pictures | Cities | The Guardian
The Dramatic History of London's Underground | Architectural Digest
Jan 10, 1863: The London Underground opens with gas-lit, steam-powered trains between Paddington & Farrington | ODD SALON
World's oldest metro systems - Railway Technology
History of the London Underground - Wikipedia
Another world first for London Underground: energy from braking trains | The Knowledge Exchange Blog
10 Oldest Subway Systems in the World (Updated 2021) - Oldest.org
Where was the first metro rail in the world? - Quora
The World's Oldest Metro Systems - WorldAtlas
A history of the London Underground - CBBC Newsround
London Underground - Wikipedia
Why Now Is A Great Time To Learn About London Underground's History - Journey With Bola
New London Subway Trains to Be Fully Automatic -- Occupational Health & Safety
London Tube's 'Mind the gap' announcer dies | CNN Travel
London underground 1863 hi-res stock photography and images - Alamy
First underground trains 1863 hi-res stock photography and images - Alamy
How the world's first metro system was built - Christian Wolmar - YouTube
Tube - Transport for London
A history of the London Underground - CBBC Newsround
Five Things You Didn't Know About The First Underground Line | Londonist
Jan. 10, 1863: Take the Tube | WIRED
File:Tube150 - Metropolitan Railway No. 1 Steam Train at Great Portland Street Tube Station.jpg - Wikimedia Commons
World's first Underground | London Transport Museum
