British Rail - Fault Finding Data and Chards For Class 25 Locomotives With Vacuum E.Q. And Duel Brakes.
Issue Date Unknown Please Contact Me if you know the date of issue for this booklet   -  Issue 2  BR33056/42 

More information can be found here Wikipedia - British Rail Class 25  Wikipedia - British Rail Eastern Region  
More Information Regarding Preserved Class 25 Locomotives can be found on the following websites:  Preserved-Diesels  Caledonian Railway Diesel Group