British Rail Train-Crew Manual - Class 56 -  Drivers Static Duties.
Issue Date May 1983   -   BR 33056/56 Issue 4 Supersedes Issue 3.


More information can be found here Wikipedia - British Rail Class 56 
More Information Regarding Preserved Class 56 Locomotives can be found on the following websites:  Preserved - Diesels - Class 56  -  The Class 56 Group