British Rail Train-Crew Manual - D1000 Class (Class 52) Locomotive with  Maybach Engines And  Voith Transmissions.
Supplement For Dual Brake Fitted Locomotives : Including Preparation and Disposal
CM&EE Paddington.    Issue Date 30th September 1968   -   BR 33057/4.


More information can be found here Wikipedia - British Rail Class 52  -  www.westernloco.com 
More Information Regarding Preserved Class 52 Locomotives can be found on the following websites:  Preserved-Diesels  -  DTG
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