The only thing I said about 1987 was that that was when the DLR opened, but not in my first post. I'm not sure how that relates to the discussion we are having atm?
I said "serious incident". Do you consider that a serious incident? No one was hurt afaik.
As I already pointed out, one of the trains being driving by a human. That and the fact that we have no further info on what the cause was seems to me that the incident doesn't count in a discussion about the safety of a complely automated system. I also said 1991 was a very long time ago; technology has move on a lot since then.
Consider this: Google's self-driving car has been driving for years with not one single incident - well there was one, but it was when a human was driving. I'm sure it's a hell of a lot harder for a computer to drive a car than it is a train.
I said the doors were for airflow, which they are. Tell me this, if they are for safety then why is it that only the deep level section so the Jubilee line extension have them?
http://www.railforums.co.uk/showthread.php?t=19286&page=2