British Rail Train-Drivers Manual - Classes 24 25 26 27 31 37 40 45 46 47 and 50Locomotives
Driver's Preperation and Disposal Duties for Diesel and Electric Locomotives With Two Driving Compartments and Duel Brakes..
Issue Date:  Unknown.   -   BR 33056/8 Issue 2.


More information can be found here Wikipedia - British Rail  or  Wikipedia - ETH