page_title: British Rail Class 700
section_title: SF7000 bogie
hierarchical_section_title: British Rail Class 700 / Manufacture, design and introduction / Design / SF7000 bogie
caption_attribution_description: English: Powered bogie on a UK Class 700 EMU
context_page_description: The British Rail Class 700 is an electric multiple-unit passenger train built between 2014 and 2018 for Thameslink as part of the Thameslink Programme in the United Kingdom.
  A fleet of 60 eight-car and 55 twelve-car trains entered service between Spring 2016 and 2018. Maintenance depots have been built at Hornsey and Three Bridges. The first train was delivered in late July 2015.
  In 2011, the consortium Cross London Trains consisting of Siemens Project Ventures, 3i Infrastructure and Innisfree was announced as preferred bidder with Siemens to manufacture the trains. The decision was politically controversial as the trains were to be built in Germany, while the competing consortium led by Bombardier Transportation had a train factory in the UK. Both the procurement process and final close of contract were significantly delayed, resulting in the expected first delivery date moving from 2012 to 2016. The £1.6 billion contract to manufacture and provide service depots for the trains was finalised in June 2013.
  The first unit, 700108, was introduced on 20 June 2016. Following the withdrawal of Class 319s, Class 700s operate on all routes across the Thameslink network.
context_section_description: Development of a new bogie type began in 2007; the design was intended specifically for the UK market as a replacement for the SF5000 bogie. To reduce energy consumption and track access charges, a key feature of the design was reduced weight: weight-saving design elements included short wheelbase, inboard frames, a bolsterless bogie design, and hollow axles. Total bogie weight is 6.3 tonnes (powered) and 4.4 tonnes (trailer), a reduction of around one third from the SF5000 design. The decision to procure a train with a new bogie design untested in the UK was challenged by several observers at a parliamentary investigation into the train procurement; rival bidder Bombardier already had a proven low-weight bogie.
  The primary suspension system uses layered rubber, with pneumatic secondary suspension. The bogie wheel base is 2,200 mm (87 in) (motor bogie) with 820 mm (32 in) wheels. Braking is by tread brakes, and regenerative braking on power bogies, and by two axle-mounted disc brakes per axle on trailer bogies.
  Prototypes of the new SF-7000 bogie were completed at Siemens' bogie plant in Graz, Austria in late 2011.
caption: Class 700 powered bogie
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