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Not going to say anything about the cost aspect but the associated link to the gravity battery concept does it a different way that is a little more space friendly by using vertical shafts/weights and by using multiple weights. An interesting idea although I can see where there could be issues using significant vertical shafts. Big problem I would have for example is our water table being too high.
Train track versus road cost would be trivial when compared to cost of buying a 70 ton lorry and good luck finding a property with 10m of elevation change you can use. The linked design gets around the issue of course by using multiple smaller weights. I did notice however that the tech specs were thin and info on weight size and shaft length were missing.