Scrapping of D stock

You're probably right tut! There appears to be a far greater number of "the sober but hopelessly bewildered" than there was in my day using the underground, although this could be a result of easy access to social media on which to whinge about their inability to look before they leap. 

They usually only make a dog's breakfast of it a couple of times though, the first occasion not being a sufficient lesson of course as it's bound to be somebody else's fault. Once the headphones are off and they stop walking along staring at a phone for long enough to actually read the describers on train and platform or listen to the announcements, everything is OK again. 

We all know having a moan against the railways is what social media is actually for, don't let anyone tell you otherwise!  Its always the railways fault, never the passenger customer

They aren't satisfactory at all. They're 35 year old technology with small doors.

When I regularly used the Central line (1973 to 1986) a lot of the platform describers were faulty. At least in those days it was possible to read the train destination blinds in bright sunlight! 

Well I guess that's a matter of opinion! I for one will be sad when their time comes. There's something about the D-Stock I find rather comforting! Although the fact that they're my regular ride probably means I am biased somewhat...! I hope it's a long time before this thread starts to beef out!

Unfortunately, the rate at which people can board is not directly proportional to the total aperture - otherwise 100 doors each 32cm wide would be as good as twenty doors 1600mm wide, or just two big doors, one in each DM, each taking up the full length of one car! People's width at the shoulder is actually remarkably uniform compared with other dimesnions, so provided the double doors on an S stock are just about wide enough for two people to use at once, then evidently the single doors on D and S stock are not, and the fact that one is 70% of the width of the S7 double doors and the other is 75% is academic. (It would make little difference if it was 55%, or 90%, of the width required for two people to pass at once - you don't get fractional passengers.
Thus the number of people who can board or alight an S7 simultaneously is 40, and for a D stock just 24.

(If two people can get their sylph-like forms through a D stock door at once, you can get three through a double S stock door!)

Evenly-spaced doors are also important: the two-huge-doors scenario would not be a good idea as people in the other cars would have an awfully long way to go to get out, and people would tend to crowd at whichever part of the platform the doors line up with.

set 7008 was the prototype refurbishment, back in the late 90s i believe. That was just an exterior refurbishment for the most part, but car 17008 got a new interior, which whilst similar to the production refurbishments, has some differences. For example, the lighting, arm rests, and the poles around the doors