First underground trains 1863 hi-res stock photography and images - Alamy
World's oldest metro systems - Railway Technology
Another world first for London Underground: energy from braking trains | The Knowledge Exchange Blog
Jan 10, 1863: The London Underground opens with gas-lit, steam-powered trains between Paddington & Farrington | ODD SALON
A history of the London Underground - CBBC Newsround
A history of the London Underground - CBBC Newsround
How the world's first metro system was built - Christian Wolmar - YouTube
London's first underground railway | The History of London
Subway | History, Transportation, Cities, & Facts | Britannica
World's first Underground | London Transport Museum
Where was the first metro rail in the world? - Quora
Tube - Transport for London
The World's Oldest Metro Systems - WorldAtlas
A short history of world metro systems – in pictures | Cities | The Guardian
Five Things You Didn't Know About The First Underground Line | Londonist
The day the Queen drove a Tube train! Fascinating black and white images celebrate 150th anniversary of the London Underground | London underground tube, London underground train, Tube train
The History Press | The history of London's Underground railway
The world's first subway opened in London | History.info
Why is the London Underground So Confusing? Part 2 - Fun London Tours
London Underground - Wikipedia
World's first Underground | London Transport Museum
Underground: How the Tube Shaped London - gallery | Books | The Guardian
Vintage pictures of the London Underground reveal what tube travel was like when the capital just had a few million residents | The Sun
