Dutch,
you may be discussing the ACS-64 and its regen features, but I am not. Again I apologize for mistakenly having put ACS-64 into the thread title. My intent was, as I mentioned above, to poke fun at the sloppy reporting which said "potentially returning ALL of the energy used to stop the train back to the overall power grid", something I know to be impossible based on things I learned in 3rd grade from Sister Europe Anasia. Or maybe it was her associate disciplinarian Attila the Nun.
For some unfathomable reason a moderator decided this general regenerative braking thread belonged in the Amtrak forum. If you want to limit the discussion to Amtrak, or the ACS-64 in particular, please make your own thread. I repeat, I, the original poster, want to discuss regenerative-dynamic braking in general, especially how efficient or inefficient it is, regardless of if it's MU's, locomotives, or water propelled funiculars.
And I'd like again to point out that you have contributed to thread creep, your first post talked about total energy to GET THE TRAIN MOVING, when my quibble was about the reporter's comment on energy to stop the train, so it's particularly unfair for you now to insist on limiting discussion to just ACS-64 locomotives.