"Mr Thant" wrote in message
...

I think all of the lines mentioned rely on platform-mounted monitors
and mirrors for checking the doors (save Overground, which has
guards), and the train also needs to be lined up with the Correct Side
Door Enable transmitter, so the driver doesn't have a lot of choice in
where they stop.

I thought that the Door Enable Transmitter was exclusive to the Jubilee
Line, because it let the driver know that he is properly lined up with the
doors. Other llines only had markers letting drivers know that they had
properly berthed.

BTW, isn't the diamond on the platform the spot that allows optimal viewing
of the mirrors?