Pulley system with yaks walking downhill to pull sleepers up it. Processes in the building of a 2 mile 'wet slide' to transport the sleepers where the river is too fierce - planning the alignment, carpenters shaping the trestles, and bits of the finished slide. A rope system for transporting sleepers down a 300ft valley, criss-crossing back and forth to the bottom. Launching the sleepers down a short slide to the river. The slide's carpenter and some children. Views of the Sutlej river, with rough spots. Travelling to Christchurch Lodge on mules.