Why not combine both? This proposal recently won a design contest, the tech already exists from maglev systems. http://www.youtube.com/watch?v=9wLokWkUdHM http:

Why not combine both? This proposal recently won a design contest, the tech already exists from maglev systems. http://www.youtube.com/watch?v=9wLokWkUdHM http://www.youtube.com/watch?v=9wLokWkUdHM