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'''Clayton Class 17 D8568''' is the only surviving example of the Clayton Type 1s which numbered 117 in total. == 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 17/3 (Beyer Peacock sub-contract built examples D8588-D8616, with Crompton Parkinson generator)
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 BR service ==
D8568 spent all of its working life in Scotland where it was delivered on 6 January 1964, to Haymarket, moving to Polmadie 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 It remained operating at this depot until it was withdrawn from service on 6 October 1971.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>
