Atmostrack Comvac
The Atmostrack Comvac is a simple and low technology component that will generate compressed air and vacuum from a combination of water and gradient, i.e. rain flowing down a mountain or a stream running downhill.
The Comvac is a low maintenance item that operates automatically during water flow and re-starts automatically when water begins to flow again.
Of course, the Comvac can be powered by an upper and a lower water storage tank with a conventionally powered pump returning water from the lower back up to the upper tank. This is just for those periods when there is no rain.
In places such as the Pacific coast of British Columbia in Canada or parts of the Pacific Coastal areas of the northern United States, or Wales, the Atmostrack Comvac can be used to provide almost all the power for a comprehensive transport web.