World's oldest metro systems - Railway Technology
First underground trains 1863 hi-res stock photography and images - Alamy
Going underground: A metro-spective to celebrate 150 years of the tube | Underground, Vintage train, Subway
First stage of 'highly complex' London Underground resignalling goes live | Metro Report International | Railway Gazette International
Underground: How the Tube Shaped London - gallery | Books | The Guardian
London Tube's 'Mind the gap' announcer dies | CNN Travel
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
London Underground - Wikipedia
The History Press | The history of London's Underground railway
The Tube: A History of the London Underground | by Igor Karasev | Medium
Five Things You Didn't Know About The First Underground Line | Londonist
World's first Underground | London Transport Museum
Vintage pictures of the London Underground reveal what tube travel was like when the capital just had a few million residents | The Sun
Riding London's Unexpectedly Fantastic Elizabeth Line | The New Yorker
New Tube for London - Wikipedia
How the world's first metro system was built - Christian Wolmar - YouTube
A history of the London Underground - CBBC Newsround
The world's first subway opened in London | History.info
A short history of world metro systems – in pictures | Cities | The Guardian
A short history of world metro systems – in pictures | Cities | The Guardian
A history of the London Underground - CBBC Newsround
Subway | History, Transportation, Cities, & Facts | Britannica
Jan 10, 1863: The London Underground opens with gas-lit, steam-powered trains between Paddington & Farrington | ODD SALON
First Day of the London Tube | History Today
