Bad movie, not so great book, but aren't Stalker's from Mortal Engines basically the same thing. Dead and brought back to serve.

I will be curious if they can not only resuscitate but also influence what is left? plus would it matter if your a victim of a seizure? would there be anything left that we see as a human personality to bring back? I ask that from experience of losing a middle aged uncle to a seizure, it raises your body temperature sufficiently to kill/wipe the brain. You can coma them to stop the activity but bringing them back up from that is no guarantee anyone is home