Well, even just weight of the people in the transfer car will make it quite heavy (few tons at least). And you are not going to make this for just 10 people at

Well, even just weight of the people in the transfer car will make it quite heavy (few tons at least). And you are not going to make this for just 10 people at each (non)stop. You could save some energy by using only recuperating electrodynamic brake to zero to stop the train and store it in some supercapacitators (not on the train, of course) if there isn't any other train to use it. Because you have many powered axles, you could brake quite effectively and fast enough. Well, possibly still not fast enough to use just EDB. Raising top speed is of course going to cause much higher aerodynamic drag, so if the energy use is primary concern, it's not exactly the right thing to do. I rather meant eliminating any drops in the average traveling speed except the stations. But I can't really argue against energy savings, because most likely, there would be energy savings :-) If you could built such a system safe enough (I don't believe that) and with less than absolutely insane costs (I don't believe that either :-)).