The 24 seconds of black and white film footage is part of that taken by the Australian War Graves Commission survey party as it travelled up the Burma-Thailand railway shortly after the war.
In the first scene, a truck, open on three sides and fitted with rail wheels travels from left to right over the Three-tier Bridge near Hellfire Pass (Konyu Cutting) and Wampo viaduct. From the camera's low angle perspective at the base of the viaduct, the characteristic criss-cross patterns of the wooden trestle construction is clearly evident.
In the second scene, the truck travels away from the camera, cutting to a wide view of the viaduct - with the sheer limestone cliff face above. Finally, in the last scene, the camera shifts position and captures the truck travelling right to left across another more open section of the bridge.
Bridge construction used local wood, which was vital given the difficulty in transporting materials to construction sites. Ideally, the wood used for bridge construction was teak, as it rotted more slowly compared to other softer woods. However, this was not always possible and parts of bridges were often built with softer, less durable wood.
Prisoners formed work gangs in the jungle cutting down wood and hauling it to worksites. Another group of prisoners would cut this wood into standard sizes. This was dangerous work, and a number of prisoners were killed or injured by falling trees, logs rolling down the hills or by splinters.
Once wood had been readied, the bridge was put together by yet another group of prisoners under the direction of Japanese engineers. Their first task was to lay the foundations. Where the ground was stable, these footings were constructed out of concrete into which the bridge trestles were inserted. Many of these footings can still be seen along the railway.
In places where the soil was soft the bridge foundations were constructed using pile driving. Long timber piles were driven into the ground using a heavy weight suspended by a rope from a timber scaffold. A team of prisoners below pulled the weight up to the desired height, after which it was dropped onto the pile. The weight would then be lifted up again and the process continued until the pile was driven far enough into the ground.
The whole scaffold would then be moved to the next pile in the bridge. Prisoners could spend their whole day lifting the weight, often while standing in the river the bridge was intended to cross.
Once the bridge foundations were laid, the pre-cut timber pieces were assembled at the site. Bamboo scaffolding was created and the heavy beams lifted up using ropes and pulleys. As with many tasks on the railway, muscle power was central to this process.
Work on bridges was dangerous. Workers ran the risk of falling off the tall structures, especially when carrying heavy loads or when the timber was wet and slippery.
Reportedly prisoners attempted to sabotage the bridges they were building, placing termite nests on the bridge timbers, or substituting poor quality wood which would make the bridge unstable.
Almost all the wooden bridges on the railway have disappeared, the notable exception being the Wampo viaduct.