LONDON - APRIL 15: Interior of the underground train car on April 15, 2015 in London, UK. The system serves 270 stations.

- Image ID: ENNPTW
Andriy Kravchenko / Alamy Stock Photo
Image ID: ENNPTW
LONDON - APRIL 15: Interior of the underground train car on April 15, 2015 in London, UK. The system serves 270 stations and has 402 kilometres of track, 52% of which is above ground.