British trains 'up to four times slower outside the south-east' | Rail transport | The Guardian
UK Cities with an Underground Metro Service | Binge Travelling
Going underground: the cheapest, deepest, oldest subway systems in the world – but which is home to its own mosquito? | South China Morning Post
End London-centric approach and invest £140bn in 11 underground systems, Scape say | Infrastructure Intelligence
MTR - Wikipedia
What the Subway Is Like in 16 Different Cities.
Travel Point Oman - This contest is now closed. QUIZZY MONDAY Which four British cities have underground rail systems? ▪️Like our page ▪️Answer the question❓ ▪️Tag a person 👫 ▪️Win🏆 Big Bus
Revealed: London's secret underground railway system - CNN Style
List of metro systems - Wikipedia
Why do so few cities in the UK have metro systems? - Quora
List of metro systems - Wikipedia
London Underground: The UK cities with an underground Tube system you might not know about - MyLondon
Rail transport in Great Britain - Wikipedia
How many cities have underground in UK? - Quora
The last metro? Crossrail and the uncertain future of urban transit | Financial Times
The World's Oldest Metro Systems - WorldAtlas
This is why Reading and four other Berkshire towns are on the London tube map - Berkshire Live
UK Transport System and How It Compares With the USA - WanderWisdom
London Underground: The UK cities with an underground Tube system you might not know about - MyLondon
Why do so few cities in the UK have metro systems? - Quora
A tale of two metros: how the London tube beat the New York subway | Underground cities | The Guardian
The power of urban rail - Arup
London Underground: The UK cities with an underground Tube system you might not know about - MyLondon
