light train goes up, heavy train goes down and regen breaks back to full battery. gravito-potential energy of raw material converts to electrochemical potential

light train goes up, heavy train goes down and regen breaks back to full battery. gravito-potential energy of raw material converts to electrochemical potential energy in the battery. That’s a cool idea. Makes sense if you can’t find the material in a lower potential energy area already, since you need to send lots of machinery up there to mine the ore.