They do this pretty often using water. I don't see why they couldn't do something similar using concrete or anything else that has some weight. This could be done really easily with rail systems as well.
They do this pretty often using water. I don't see why they couldn't do something similar using concrete or anything else that has some weight. This could be done really easily with rail systems as well.
Both are done, with water it's called pumped hydro. For the rails, see ARES.