I was reading about the infinity
train
recently. This is a battery powered electric train that never needs
recharging, at least not in normal operation. This sounds impossible,
but in this case it works because the train is used in mining
operations. The minerals are mined in the middle of Australia and then
shipped to the coast; the point being that energy regenerated from the
braking on the way to the coast, when the train is fully loaded, is used
to charge the batteries to return the train to the mine when it is
empty. It’s like a virtual counter-weight system.