This is the default configuration wherever deep-level tube trains operate.
![london underground simulator piccadilly line london underground simulator piccadilly line](https://i.ytimg.com/vi/k3Z570ukgE8/maxresdefault.jpg)
The configuration and potential of the conductor rails varies across the network. The lines are electrified with a four-rail DC system.
![london underground simulator piccadilly line london underground simulator piccadilly line](http://lutrainz.com/1995stock.jpg)
The older Metropolitan line train A Stock bound for Amersham The Royal Borough of Greenwich had no Underground station until North Greenwich station opened in 1999 on the Jubilee line extension.
![london underground simulator piccadilly line london underground simulator piccadilly line](https://c8.alamy.com/comp/HJTFHC/view-of-the-london-underground-subway-piccadilly-line-with-train-at-HJTFHC.jpg)
For the most part however, some of the tube lines like the Central line skirt around the perimeter of Hackney rather than going straight through it. Of the boroughs through which the Underground lines pass, Hackney is served solely by Manor House station on the Piccadilly line on the very north-western boundary of the borough. The borough of Lewisham used to be served by the Underground on the East London line – now part of London Overground – at New Cross and New Cross Gate. All of these are south of the River Thames: Bexley, Bromley, Croydon, Kingston, Lewisham and Sutton. Six of the 32 London boroughs are not served by the Underground. Ī geographical map of the London Underground, showing the proportional spread of the network over the city (except for Amersham and Chesham stations, which are not in the field of view in the top left) The Victoria line has right-hand running between Warren Street and King's Cross St Pancras, allowing cross-platform interchange with the Northern line (Bank branch) between northbound and southbound trains at Euston. Trains generally run on the left-hand track, although in some places, for example the Central line east of St Paul's station, tunnels are dug one above each other. There are 20 miles (32 km) of cut-and-cover tunnel and 93 miles (150 km) of tube tunnel, the other 55% of the system running above ground. The deep-tube lines generally have the exclusive use of a pair of tracks, except for the Piccadilly line, which shares track with the District line between Acton Town and North Ealing and with the Metropolitan line between Rayners Lane and Uxbridge, and the Bakerloo line, which shares track with London Overground services between Queen's Park and Harrow & Wealdstone. Many of the central London deep-tube line stations, such as those on the Central and Piccadilly lines, are higher than the running lines to help with deceleration when arriving and acceleration when departing. These were called the tube lines, although since the 1950s the term "tube" has come to be used to refer to the whole London Underground system. The Bakerloo, Central, Jubilee, Northern, Piccadilly, Victoria and Waterloo & City lines are deep-level tube lines, with smaller trains running through two circular tunnels with a diameter of about 11 feet 8 inches (3.56 m), lined with cast-iron or precast concrete rings, which were bored using a tunnelling shield. The Hammersmith & City and Circle lines share all their stations and most of the track with other lines. The tunnels and trains are of a similar size to those on British main lines. The Circle, District, Hammersmith & City, and Metropolitan lines are services that run on the sub-surface network that has railway tunnels just below the surface and built mostly using the " cut-and-cover" method. A Metropolitan Line 'A' stock subsurface train and a Piccadilly Line 1973 tube train.A sub-surface Metropolitan line A Stock train (left) passes a deep-tube Piccadilly line 1973 Stock train (right) in the siding at Rayners Lane. London's underground trains come in two different sizes - the smaller 'tube' trains and the larger 'mainline' size trains.It also has one of the highest number of stations. The Underground has 270 stations and 402 kilometres (250 mi) of track, making the longest metro systems in the world.This photograph shows a southbound Northern Line train leaving a tunnel mouth just north of Hendon Central station. The nickname "Tube" comes from the almost circular tube-like tunnels through which the small profile trains run.This image shows the two variants side by side. In 1973 this was changed to 'bus' red with white lettering.
![london underground simulator piccadilly line london underground simulator piccadilly line](https://live.staticflickr.com/4589/27405841099_dd39a71bf5_b.jpg)