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
London Underground in a station. Similarly, Poems on the Underground has commissioned poetry since 1986 that are displayed in carriages. The Underground (including several fictitious stations) has been featured in many movies and television shows, including "Skyfall", "Die Another Day", "Sliding Doors", "An American Werewolf in London", "Creep", "Tube Tales, Sherlock" and "Neverwhere". The London Underground Film Office received over 200 requests to film in 2000. The Underground has also featured in music such as The Jam's "Down in the Tube Station at Midnight" and in literature such as the graphic novel "V for Vendetta". Popular legends about the Underground being haunted