London Underground is made up of 12 lines, each with their own unique colour so you can easily follow them on a map. Most lines run through central London, and many serve parts of Greater London.
Train Directions
Trains and platforms are described as eastbound, westbound, northbound or southbound depending on the direction of the line. Trains travelling from left to right on the tube map are eastbound, from right to left are westbound, from top to bottom are southbound and from bottom to top are northbound.
Zones
London's tube system is split into 6 'zones' which appear in concentric circles. On the tube maps, central London is zone 1 (the middle circle), and the further away you travel from central London, the higher the zones get.
Travel is cheaper in zones 3, 4, 5 and 6 than in zones 1 and 2. However, you need to pay for all zones you travel through during your journey.