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 Borough of Havering private rented housing in Havering is the most affordable of any London borough. Named neighbourhoods are the developments of Ardleigh Green, Chase Cross, Collier Row, Elm Park, Harold Hill, Rainham. The borough's exurbs with green buffers of farmland or parkland are: The M25 motorway forms part of the borough boundary to the east with North Ockendon the only settlement to fall outside. The A12 (near Romford) and the A13 (near Rainham) are the main trunk radial routes from central London and are located to the north and south of the borough respectively. The A127 trunk route to Southend begins at