Currently 1,107 million passengers are carried every year. Each year, every Tube train travels 114,500miles/184,269km. Police reports of German bomb raids on London in 1917 estimated that 300,000 people were taking shelter in Tube stations.The average speed of a train is 33km/20.5 miles per hour. The total number of carriages in the Underground’s fleet is 4,134. A ghost named Annie Naylor, a dead milliner, aka the “Screaming Spectre”, is said to haunt Farringdon station. Likewise, actor William Terris “haunts” Covent Garden. The original trains had three different classes, costing three, four and six pence for a single journey.  A single cash journey in Zone 1 now costs £4.50. The total length of the Tube  network is 402km/249 miles. The busiest station in London is Waterloo, which has 57,000 people entering during the three-hour morning peak. In 1956, to fill staff shortages, London Transport began to directly recruit in Barbados and Jamaica. By 1969 over 4,000 staff from West Indies has been recruited by London Transport. Three babies have been born in the London Underground. The most recent was a boy, born in December 2008.

(Source and more facts: The Independent)