The box contains English Electric black and white negatives of equipment, cubicles and Portugal locomotives:

BT/C52/1 to 26, BT/C53/1 to 102, BT/C54/1 to 149

Samples of the contents are:

BT/C52/1 Knife switch panel

BT/C52/26 Cubicle in a locomotive

BT/C53/1 Rear view of cubicle showing power cables

BT/C53/41 Switch box with cover removed

BT/C53/50 Cubicle with covers removed

BT/C53/101 Front view of cubicle with covers off

BT/C53/102 Equipment cubicle – covers on

BT/C54/1 Resistor frame in box

BT/C54/50 Pantograph springs (on a diamond pantograph)

BT/C54/91 Resistor

BT/C54/100 Locomotive cab

BT/C54/149 Equipment cubicle