British Rail Train-Crew Manual Class 97/7 Locomotives (Battery Operated)
The 97/7 Locos consist of a pair of motor coaches converted form class 501 Euston - Watford DC EMU stock designated A & B.
The former passenger compartments contained sealed Lead Acid Batteries and control Equipment.

Issue Date August 1981      -  Issue 1.

More information can be found here Wikipedia - British Rail   -   Wikipedia - Class 97 Locos (BR)