Centaur wrote:
"Michael Bell" wrote in message
The time wasted on opening and closing the tube doors has
always irritated me.

Yes I agree time is lost, bear in mind of course that on the Central the
circuitry has to 'make' when the train stops over the PAC [Platform ATO
Communications Transmit/Receive] at platform stopping marks.

It used to be, in the days of guards, that opening would be timed so
that the front door of the pair slammed into its stop as the train came
to a halt, with the rear door completing its opening just after. No time
lost there!

No doubt there are at least two reasons why that wouldn't happen now.

Doors on the Madrid Metro open very fast compared to the leisurely
London ones - though new Central Line doors seem to be faster. (Haven't
observed 95 and 96 stock - are they faster than the older designs too?).
The speed the doors move must make a difference to overall dwell times.

Colin McKenzie