how many tube stations are there in london
London Underground The system's first tunnels were built just below the surface, using the cut-and-cover method; later, smaller, roughly circular tunnels – which gave rise to its nickname, the Tube – were dug through at a deeper level.[8] The system has 270 stations and 250 miles (400 km) of track.[9] Despite its name, only 45% of the system is actually underground in tunnels, with much of the network in the outer environs of London being on the surface.[9] In addition, the Underground does not cover most southern parts of Greater London, with less than 10% of the stations located south of the River Thames.[9]