Editing District line (section)

=== London Transport ===
On 1 July 1933, the District Railway amalgamated with other Underground railways, tramway companies and bus operators to form the [[London Passenger Transport Board]], and from 23 October 1933 Piccadilly line trains ran through to Uxbridge and the District line shuttle was withdrawn.{{sfn|Horne|2006|p=65}} Most of the trailer cars on the District line were the 1904–1905 [[London Underground B Stock|B Stock]] type with wooden bodies, but motor cars were less than fifteen years old. The 1935–1940 [[New Works Programme]] saw the [[London Underground Q Stock|Q Stock]] formed from these motor cars, upgraded with electro-pneumatic brakes and guard controlled air-operated doors, and the trailers replaced with new vehicles.{{sfn|Bruce|1983|p=36, 83, 96}} The off-peak District line services on the Hounslow branch were withdrawn on 29 April 1935 and South Acton served by a shuttle to Acton Town.{{sfn|Horne|2006|p=60}}

[[File:R Stock painted and unpainted at South Kensington.jpg|thumb|left|An R Stock train composed of a mixture of unpainted aluminium and (white) painted steel cars]]

The [[London, Midland and Scottish Railway]] (LMS) had taken over the L&NWR railway's service from Earl's Court and by the [[Second World War]] this had been cut back to an electric Earl's Court to Willesden Junction shuttle.{{sfn|Horne|2006|p=60}} Following bombing of the West London Line in 1940, the LMS and the Metropolitan line services over the [[West London Line]] were both suspended. This left the [[Olympia (London)|Olympia exhibition centre]] without a railway service, so after the war the Kensington Addison Road station was renamed [[Kensington (Olympia)]] and served by a District line shuttle from Earl's Court.{{sfn|Horne|2006|p=73}} [[London Underground R Stock|R Stock]], composed of new cars and the Q Stock trailers that had been built in 1938, replaced the trains with hand-operated sliding doors that remained.{{sfn|Horne|2006|pp=74–75}} The new trains were built between 1949 and 1959,{{sfn|Horne|2006|p=75}} and after 1952 trains were constructed from aluminium, saving weight. One train was left unpainted as an experiment and considered a success, so between 1963 and 1968 trains were left unpainted or painted white or grey to match.{{sfn|Bruce|1983|pp=100–101}} The transfer of [[London Underground O and P Stock|CO/CP Stock]] from the Metropolitan line in the early 1960s allowed some of the Q stock to be scrapped.{{sfn|Bruce|1983|p=97}} The slow tracks on the former LT&SR line to Upminster were shared with steam locomotive hauled goods and passenger services, until 1961 when the District took over exclusive use of the DC electrified lines.{{sfn|Horne|2006|pp=80–82}}

The South Acton shuttle was withdrawn on 28 February 1959, followed by the peak hour District line through service to Hounslow on 9 October 1964.{{sfn|Horne|2006|p=88}} The whole District line service could not run through Aldgate East as this station was also served by Hammersmith & City trains, so some trains terminated at a bay platform at Mansion House, leaving the line east to Tower Hill overcrowded. Tower Hill station was also cramped, so the station was rebuilt with three platforms on a new site. This opened in 1967 and a year later trains reversed at the new station.{{sfn|Horne|2006|pp=88–89}}

Services were operated with 6 cars off-peak and 8 cars during peak hours until 1971, when trains were reformed as fixed 7-car trains, and some 6-car trains for the Edgware Road branch.{{sfn|Bruce|1983|pp=103, 118}} The CO/CP and R Stock were replaced in the late 1970s by new trains with unpainted aluminium bodies.<ref name="RSI">{{cite web|title=Rolling Stock Information Sheets |url=http://www.tfl.gov.uk/assets/downloads/foi/Rolling_stock_Data_Sheet_2nd_Edition.pdf |access-date=26 November 2012 |publisher=London Underground |url-status=dead |archive-url=https://web.archive.org/web/20131004231025/http://www.tfl.gov.uk/assets/downloads/foi/Rolling_stock_Data_Sheet_2nd_Edition.pdf |archive-date=4 October 2013}}</ref> A shorter train was needed on the Edgware Road branch due to the platform lengths so more of the [[London Underground C69 and C77 Stock|C stock]] units, then already in use on the Circle and Hammersmith and City lines, were built.{{sfn|Bruce|1983|p=117}} The rest of the District line could use longer trains and new [[D Stock]] trains were introduced between 1979 and 1983.<ref name="RSI" /> [[Driver-only operation]] of the trains was proposed in 1972, but due to conflict with the trade unions was not introduced on the District line until 1985.<ref>{{cite book|last1=Croome|first1=Desmond F.|last2=Jackson|first2=Alan Arthur|title=Rails Through the Clay: A History of London's Tube Railways|year=1993|publisher=Capital Transport|page=468|isbn=978-1-85414-151-4}}</ref> In 2003, the infrastructure of the District line was partly privatised in a [[public–private partnership]], managed by the [[Metronet (British infrastructure company)|Metronet]] consortium. Metronet went into [[Administration (law)|administration]] in 2007 and the local government body [[Transport for London]] took over responsibilities.<ref>{{cite web|url=http://www.tfl.gov.uk/assets/downloads/london-underground-ppp-performance-report-2009-2010.pdf |title=PPP Performance Report |date=2009–2010 |publisher=Transport for London |access-date=7 March 2012 |pages=7–8 |url-status=dead |archive-url=https://web.archive.org/web/20120426034334/http://www.tfl.gov.uk/assets/downloads/london-underground-ppp-performance-report-2009-2010.pdf |archive-date=26 April 2012}}</ref>