was carried out by Railcare at Wolverton Works. The Stone Faiveley AMBR pantograph was replaced by the industry standard Brecknell Willis high speed pantograph. Units were reclassified as Class 317/6 and were renumbered into the range 317649–672. Many of the WAGN Class 317/1 units still wore the Network SouthEast (NSE) blue and red livery dating from 1986. In 2001, a new livery of metallic purple with lilac doors was introduced. The first unit so treated was 317 312, which had recently returned from loan to LTS Rail. The livery was progressively applied to the Class 317/1 fleet, with the final NSE examples (317 328 & 317 345) disappearing by mid-2004. By April 2004, the only units not repainted were 317301–307, which were hired to Thameslink and remained in LTS livery. The WAGN purple livery was also applied to Class 313 and Class 315 EMU trains. In April 2004, the WAGN franchise was split into the Great Northern and West Anglia routes. The latter became part of the new National Express East Anglia franchise, which operated under the title of One Railway. Great Northern was temporarily operated independently under the WAGN brand name, until it was merged with the Thameslink franchise in April 2006. These changes resulted in the Class 317 fleet being divided among First Capital Connect and National Express East Anglia. First Capital Connect carried out a minor interior refresh to its 12 Class 317 EMU trains inherited from WAGN. Govia Thameslink Railway operated the 12 strong Class 317/1 fleet from when the new franchise began on 14 September 2014 until 21 May 2017 where they were replaced by the Class 387. These units formerly operated Great Northern services, but have since transferred to Greater Anglia. London Overground On 31 May 2015, London Overground took over operation of the Liverpool Street to Chingford, Enfield Town and Cheshunt via Seven Sisters, using eight units Class 317/7 and six units Class 317/8. All these trains had an exterior repaint, however not all were internally refurbished. They were all replaced by Class 710 "Aventra" in 2020. LTS Rail & c2c In 1996, LTS Rail (renamed c2c in 2000) began to hire Class 317/1 units from its sister Prism Rail franchise WAGN for use on the London, Tilbury and Southend railway. At first only two units were hired, but by mid-1997 this had increased to a total of 18 units. Units were maintained