This short section of tramway was a self-acting inclined plane - i.e., two sets of wagons were connected together by a rope, chain, or (more likely) a steel cable.
The cable would have been wound around a drum installed at the top of the incline. The drum was probably positioned on the level platform that can be seen just beyond the rocks in the foreground of large image below. The weight of descending full wagons would have been sufficient to haul the empty wagons back-up the incline. The linear feature in the middleground of the image (slightly right of centre) is the abandoned trackbed of the tramway itself.