conditioning was added and the opening hopper windows replaced with sealed units. A new passenger information system, similar to that on the Class 168 Clubman trains, CCTV cameras and an area designated for the use of wheelchair users were added and the first-class section was removed, as Chiltern became a standard-class-only railway in 2003. The original 3+2 seating at the outer ends of the driving vehicles was replaced by new 2+2 high-back seating. The existing 3+2 low-back seating was retained in the centre areas of the driving vehicles and throughout the centre vehicles of the three-car units. A cycle/wheelchair area with tip-up seats was also added to each unit. A further refurbishment began in 2015, concentrating on the toilet areas, to make these units fully Disability Discrimination Act 1995 (DDA)-compliant for operation beyond 2020. They can often be found on the Aylesbury to London Marylebone routes including the Princes Risborough shuttle. Great Western Railway Thames Valley The Class 165/1 fleet were built for local services from along the Great Western Main Line; their main destinations included local trains to , , , , Oxford, and , and services along the branch lines to , , and . Following the privatisation of British Rail, the franchise was won by the Go-Ahead Group, who operated it as Thames Trains from 1996 to 2004 and inherited all the Class 165/1 Turbo trains as well as the first five Class 165/0 Turbo trains that had been transferred from the Chiltern lines. In April 2004, operation of the Thames Trains franchise passed to First Great Western Link. In 2004, due to deliveries of new Class 180 Adelante units on sister company First Great Western, the five Class 165/0 Turbo units became redundant and were transferred to Chiltern Railways. In January 2010, First Great Western announced an £8 million refurbishment programme for its fleet of Classes 165 and 166 Turbo DMU trains: seats re-trimmed interiors repainted Passenger Information Displays replaced with a GPS-based system upgraded lavatory facilities flooring stripped and replaced In 2012, First Great Western took delivery of Class 180 Adelante units for Cotswold Line services, and three-car Sprinter units for Reading to Basingstoke Line services, allowing Class 165 and 166 units to be used to reinforce Thames Valley services. In late 2015, as part of the rebranding to GWR, the Class 165 fleet had all first-class sections removed to increase capacity. Following the electrification