British Rail Train-Crew Manual - Class 90 Locomotives - Drivers General Information, Driving Instructions, Drivers Static Duties and Drivers Fault Finding Data.
Issue Date September 1988  -   BR 33056/128    -   Issue 1.

More information can be found here Wikipedia - BR Class 90
Information relating to privately owned AC Locomotives can be found here -   The A C Loco Group & Electric Traction Ltd.