I rode one of these near a small village in India. At the time, it really baffled me. This helps, although it’s still not completely clear as it was sort of jerry rigged. So it doesn’t look anything like this, and due to the length of time that’s passed, I don’t remember all the details either but I’ll try to recollect <br><br>In the case of the one I rode, the ferry itself was the runner on the wire across the river. The object which harnessed the power of the river (the ferry in the video) was an old 80 liter HDPE drum. I don’t remember any more details, unfortunately.