> Most of the energy used accelerating is recovered at the next stop, so the fast acceleration does not consume much energy.
Not "most," but a lot. From the article:
> regenerative braking on the new trains is generating and sending back to the electric grid approximately 23% of the energy consumed by the system
Not "most," but a lot. From the article: > regenerative braking on the new trains is generating and sending back to the electric grid approximately 23% of the energy consumed by the system