[kempe]

So when the train needs to break it generates energy for storage that can be used later uphill etc. Simple and interesting, especially for regions with a lot of variation of heights.

[nekopa]

Methinks your comment is misplaced.

But I did have a moment of joy at the Monty Python-esque comedy it brought on :)

[kempe]

LOL yes it is, was supposed to go to another article.

[koluft]

This is also how electric car brakes work, going back to the Prius.

[maaku]

The concept of a flywheel goes back much further than that.