Mark 3 coaches sandwiched between two Class 43 locomotives. GWR operated the largest InterCity 125 fleet, owning five sets outright; the rest were leased from Angel Trains and Porterbrook. From 2009 to 2012 (when Class 180s were reintroduced on the Cotswold line) all the company's intercity services were worked by HSTs except the Night Riviera sleeper service between London Paddington and Penzance. From late 2017, following the completion of electrification from to the west of England, intercity services gradually became operated by Class 800 IETs, although a few peak services remained operated by HSTs until early 2019. GWR continued to use HSTs on services to Exeter, Plymouth and Penzance until May 2019, when they were all withdrawn in favour of Class 802 units. The youngest Class 43 locomotive dated from 1982. After a successful trial by Angel Trains and FGW in 2004, two power cars received new MTU engines while two received new Paxman VP185s, fitted by Brush Traction of Loughborough. The MTU engine proved the better option, both for reliability and for emissions, resulting in FGW, Brush and Angel Trains starting the HST Modernisation programme. The last power cars to be re-engineered were released in April 2008, while several other companies' HSTs have now all undergone a similar programme. GWR's High Speed Train fleet were refurbished by Bombardier in Derby and Ilford between 2006 and 2008, with leather seats introduced in first class, redesigned toilets, a redesigned buffet, and at-seat power points. The company opted for mainly airline seats, giving more seats per train. Following the Southall and Ladbroke Grove rail crashes, GWR requires its HSTs to have automatic train protection and Automatic Warning System safety systems in operation. If either is faulty, the train is not used. Class 150/2 Sprinter The fleet of 17 two-coach Sprinter units was inherited from Wessex Trains as part of the Greater Western franchise shuffle. The fleet had been refurbished by Wessex Trains in 2003, with 2+2 seating arranged in a mixture of 'airline' (face to back) and table seating. The fleet is widespread throughout the former Wessex area, and carried a maroon livery with advertising vinyls for South West Tourism. Each unit was sponsored by a district, town or attraction and carried a unique livery. Most received names of attractions, places and branch lines. Two units were repainted into the new First 'Local' livery, but all units are now due to receive