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|wheels = Bo-Bo
|power = Diesel Electric
|status = Operational, based on Chinnor & Princes Risborough Railway
|locono = D8568
|othernos = 8568
}}
'''Clayton Class 17 D8568''' is the only surviving example of the Clayton Type 1s which numbered 117 in total. The locomotive is based at the Chinnor & Princes Risborough Railway and is used during the running season and at special events. It is owned by the [[Diesel Traction Group]]. It was [[Diesel Locomotives hired by the SVR|hired by the SVR]] from May to September 2017 and has also attended that year's a number of [[Diesel Locomotives visiting the SVR for galas|Diesel galagalas]], having previously visited in 1998 and 2015. A further visit is announced for 2019.
== D8568 in BR service ==
Intended by British Railways as the standard Type 1 for 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 of the locomotives survived long enough for renumbering.
All but two of the class were fitted with pairs of the 450hp Paxman 6ZHXL 6-cylinder horizontal engines designed for (but never used in) in railcars. Three variations of the class were built:
*Class 17/1 (Clayton locomotives, with GEC generator)
*Class 17/2 (two locomotives), with Rolls Royce engines
The Class was equipped for multiple working with 'Red Diamond' (Class 17/3: 'Blue Star') locomotives. Although D8568 is the unique survivor one of each sub-class 17/1 (8521) and 17/3 (8598) 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>
== D8568 in industrial service ==
== D8568 in preservation ==
As it is owned by the Diesel Traction Group, which has other locomotives based on the SVR, it is has been a visitor for [[Diesel Locomotives visiting the SVR for galas|galas]], first in 1998 and several times from 2015. It also may visit for repairs, and arrived in January visited from 2020 to 2022 for just such repaint into BR blue livery, bodywork attention and workon the Paxman engines<ref>[https://www.svrlive.com/blsep20 Branch Lines newsletter, September 2020] (Retrieved 29 August 2020)</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>
==See also==
