London Underground infrastructure Tube Programme, investigating replacing the trains for the Bakerloo and Piccadilly lines, is looking for trains with better energy conservation and regenerative braking. The Underground serves 270 stations. Fourteen Underground stations are outside Greater London, of which five (Amersham, Chalfont & Latimer, Chesham, and Chorleywood on the Metropolitan line and Epping on the Central line) are beyond the M25 London orbital motorway. The longest distance between two stations is between Chalfont & Latimer and Chesham on the Metropolitan line. The shortest distance between adjacent stations is the between Leicester Square and Covent Garden on the Piccadilly line. The station furthest
Safety on the London Underground a six-month trial period in all parts of the Underground, and the ban was made permanent after the major King's Cross fire in November 1987. From 1 June 2008 an alcohol ban was introduced on all TfL services. This change in policy was made by Boris Johnson soon after he was elected Mayor of London in May 2008. He claimed that a public transport drinking ban would reduce crime. Following the 1987 King's Cross fire as well as the permanent smoking ban on all London Underground premises, the programme of wooden escalator replacement was sped up, and stricter controls on