Quote:
Originally Posted by emathias
Many electric trains coming on line these days use regenerative breaking, and at least some of them use batteries to store it instead of just dumping it back onto the grid. So the answer to your question, at least in terms of the "100s of feet" would be that they already exist. I'm not sure how many hundreds of feet currently use batteries would support, though, certainly not miles worth.
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I tried promoting something like that a few years back, it went over like a Hang Glider made of concrete:
http://regenerativehybridunit.yolasite.com/