From ScR Training notes, thought to be circa late '60s? Originally on foolscap, the portion to the left is missing on my A4 photocopy. As a ScR document, it is likely for a Class 107 centre car.
14" diameter, twin field control, output 150 amp.
RUG 12 rectifier (dual feed), lead acid BRA2 cells
For Derby trailer non-power vehicles
A1002 - The Lamp Resistance
D1001 - Train Lighting Introduction
D1009 - Control Panel Description
E1016 - Panel, Enclosure - Open
E1018 - Panel, Totally Enclosed
P1002 - "Liliput" Regulator
P1006 - Tonum Control Panel
W1009 - Control Panel Diagrams