The box contains film negatives and are of locomotives or emus, electrical control equipment, and components in sequential bundles. A sample from each bundle:

BT/C61/100-237; BT/C62/1-155; BT/C63/1-156; BT/C64/1-99

BT/C61/30 - Dibilier NITROGOL capacitor, 16µF, 1000V

BT/C61/200 - Frame with 13 wire-wound adjustable resistors

BT/C61/230 - Power switch contact units

BT/C62/20 - Assembly of a fused rectifier module

BT/C62/120 - Electromagnetic relay type NL8F6

BT/C63/35 - Rotary switch unit

BT/C63/135 - Rotary control switch

BT/C64/25 - Electro-pneumatic contactor unit type NA15-A

BT/C64/75 - Electro-pneumatic camshaft unit with 7 power-circuit cams