\r\nThe traction upgrade work involves replacing life-expired dc equipment with an ac system incorporating IGBT technology developed by Kiepe Electric D\u00fcsseldorf which will increase the trains\u2019 reliability and efficiency. The trains will also be fitted with a new regenerative braking system supplied by Knorr-Bremse Rail Vehicle Systems.The interior refurbishment includes the fitting of new seats and carpets. At-seat power points will be installed in all classes with table-top charging available in first class, and new LED lighting available throughout the trains. Disabled passengers will also benefit from new universally-accessible toilets and specially-designed seating.\r\nThe refurbished trains will enter service on London Waterloo - Portsmouth Harbour line from December 2018. The total cost of the fleet refurbishment is \u00a345m.