page_title: Victoria line
section_title: Service and rolling stock
hierarchical_section_title: Victoria line / Service and rolling stock
caption_attribution_description: 09
context_page_description: The Victoria line is part of the London Underground network. It is a deep-level underground metro line that runs from Brixton in south London to Walthamstow Central in the north-east. It started running in 1968. On the Tube map it is shown with a light blue color. It is the fourth busiest line on the London Underground network. It is the only line on the Underground, other than the two-stop Waterloo & City line, which is completely underground. The only section of track to come above ground is the route to the depot from Seven Sisters to Northumberland Park.
  The Underground line has hump-backed stations which allow trains to store gravitational potential energy as they arrive and to then use this energy as they leave the stations. The stations are on top of small hills, or humps. As the train travels up the hill to the station its weight helps it to slow down. As the train leaves the station it travels down the hill, with gravity helping the train to speed up. This saves 5% energy and makes the trains run 9% faster. Each new platform built for the Victoria Line is 132.6 metres long. Around 200 million people use the Victoria line each year.
context_section_description: Trains run every two minutes during peak periods (when its the busiest). In normal service, all trains run from Brixton to Seven Sisters. About three out of five continue to Walthamstow Central.
  When the line first opened it was served by a fleet of 8-car 1967 tube stock trains. Each is made up of two four-car units. Later on, a number of cars of 1972 Mark I tube stock were adapted to work with the 1967 stock. This meant that there were finally 43 trains, each of which was made up of two four-car units. The 1967 tube stock was replaced by 2009 tube stock between 2009 and 2011 (see below).
  At first, an articulated type of rolling stock was thought about. This idea was not used because it would have been too hard to move the stock to Acton Works for heavy overhauls. This is no longer a problem since train overhauls have been moved away from Acton Works to the builders' own works. The new 2009 tube stock is wider and the carriage is slightly longer. This means it can only run on the Victoria line, as it is too wide for the tunnels of other deep level tube lines.
  The line has an Automatic Train Operation system (ATO). The train operator (driver) closes the train doors and presses a pair of "start" buttons. If the way ahead is clear, the ATO drives the train at a safe speed to the next station and stops there. This system has been in place since the line opened in 1968. This makes the Victoria line the world's first full-scale automatic railway.
caption: The 2009 stock at Green Park tube station. This stock has been the only stock used since 2011.
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