The box contains film negatives in printed buff envelopes. The origin is EE Bradford or Preston and all photos are of locomotives or emus, electrical control equipment, and components in sequential bundles. They are listed by group or set of photographs, not by individual photos. A sample from each bundle is detailed below:

BT/C58/52 - 131; BT/C59/1 - 254; BT/C60/1 - 283

Sampled items:

BT/C58/60 - 6-way auxiliary contact block for relay or contactor

BT/C58/120 - Roof-shaped control frame with load-regulator for diesel-electric loco or emu

BT/C59/50 - Electro-pneumatic contactor unit

BT/C59/150 - Electro-pneumatic contactor operating cylinder with auxiliary contacts

BT/C59/250 - Laminated core in frame for transformer or inductor unit

BT/C60/60 - Power camshaft assembly with 6 power cams

BT/C60/150 - Power contact unit with blowout coil

BT/C60/240 - Control panel with various relays