British Rail Train-Crew Manual - Class 46 -  Drivers Fault Finding Data
Issue Date May 1981   -   BR 33056/44 Issue 3.


More information can be found here Wikipedia - British Rail Class 46  -  Derby Sulzers Website 
More Information Regarding Preserved Class 46 Locomotives can be found on the following websites:  Preserved-Diesels  -  Llangollen-Diesels