British Railways Driver's Manual - Class 56 - Preparation and Disposal
Instructions for Class 56 Locomotives.
Issue Date: February 1977 - BR 33056/56 Issue 1.
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