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'''Clayton Class 17 D8568 ''' is the only surviving example of the Clayton Type 1s which numbered 117 in total. The locomotive is based at Intended by British Railways as the standard Type 1 for the Chinnor & Princes Risborough Railway and is used during railway system, supplanting the running season and at special eventsEE type 1 (later class 20), poor reliability meant withdrawals began as early as 1968, when some members were just four years old. It is owned by Although the Class was allocated a [[Diesel Traction GroupTOPS codes|TOPS code]], none of the locomotives survived long enough for renumbering.

It was [[Diesel Locomotives hired by the SVR|hired by the SVR]] from May to September 2017 and attended that year's [[Diesel Locomotives visiting the SVR for galas|Diesel gala]], having previously visited in 1998 and 2015. A further visit is announced for 2019.  Intended by British Railways as the standard Type 1 for All but two of the railway system, supplanting the EE type 1 (later class 20), poor reliability meant withdrawals began as early as 1968, when some members were just four years old. Although the Class was allocated a [[TOPS codes|TOPS code]], none fitted with pairs of the locomotives survived long enough 450hp Paxman 6ZHXL 6-cylinder horizontal engines designed for remumbering(but never used in) in railcars. Two Three variations of the class were built:

The Class was equipped for multiple working with 'Red Diamond' and (Class 17/3: 'Blue Star' ) locomotives respectively. Although D8568 is the unique survivor one of each sub-class 17/1 (8521 ) and 17/3 (8598 respectively) survived into BR Departmental service at Derby Research Centre until 1978.<ref>[https://www.railuk.info/diesel/getclass.php?id=69 Railuk.info] (Retrieved 4 August 2019)</ref>.

The loco D8568 spent all of its working life in Scotland where it was delivered on the 16th 6 January 1964, to Haymarket, near Edinburgh, moving to Polmadie, near Glasgow during on 28 September 1968. It remained operating at this depot until it was withdrawn from service on 6 October 1971.<ref>[http://www.brdatabase.info/locoqry.php?action=class&id=17&type=D&page=alloc BR database] (Reterieved 4 August 2019)</ref>

Sold from Polmadie, D8568 went to Hemelite of Harpenden, a cement company on the former branch line between Harpenden and Hemel Hempstead. It arrived under its own power on 11 September 1972, to became become the first 'privately owned' ex-main line diesel loco to break the 'no private diesels BR ban'.

Purchased by the DTG it left Clitheroe on 9 February 1983 for the North Yorkshire Moors Railway, returning to traffic 22 April 1989. On 25 April 1992 it arrived at its present moved to a new home on the Chinnor and Princes Risborough Railway. As it is owned by the Diesel Traction Group, which has other locomotives based on the SVR, it was a visitor for [[Diesel Locomotives visiting the SVR for galas|galas]], first in 1998 and several times from 2015 with extended stays. During such visits it was sometimes referred to as a 'home fleet' locomotive in publicity. It was [[Diesel Locomotives hired by the SVR|hired in]] between May and September 2017. D8568 also visited for repairs, and from 2020 to 2022 underwent a repaint into BR blue livery, bodywork attention and work on the Paxman engines,<ref>[https://www.svrlive.com/blsep20 Branch Lines newsletter, September 2020] (Retrieved 29 August 2020)</ref> before returning to Chinnor to complete its agreed running dates. The loco is now based at the SVR<ref>SVR Operations Manager, 15 March 2023</ref>. <gallery mode=packed heights=200px style="text-align:left">D8568_20150930.jpg|D8568 passing Highley, September 2015D8568_20210813.jpg|D8568 repainted in BR blue livery, August 2021</gallery>

*[[Diesel Locomotives visiting the SVR for galas]]<br>*[[Diesel Locomotives hired by the SVR]]*[[Diesel Locomotives]]*[[SVR-based diesel locomotives visiting other events]]*[[Diesel Traction Group]]

*[http://www.westernchampion.co.uk/loco-d8568.php DTG web site]<br>*[https://en.wikipedia.org/wiki/British_Rail_Class_17 Class 17 on Wikipedia]