Originally Posted by PastramiX
I suppose that no one here has heard of an obscure invention from not to far ago, something called a "battery", which supposedly "stores" electricity for later use. Probably a load of sensationalist poppycock, though.
That was completely unnecessary and didn't add to the debate.
I knew of the invention you spoke of and also knew that it can not be implemented on a practical scale for use with a power grid. Those batteries on diesel hybrid engines only store energy to augment the electric motors, but nothing beyond that is needed for storage on a massive scale.
Plug-in hybrids are meant to store energy for trips, using a gasoline engine only to sustain and recharge those batteries. Those are not really feasible for something the size of a train.