Fine. ALL trains are 'articulated', so we need another word for Gresley-type articulation. Now, SOME trains don't run on rails, so we need another word for rail-borne trains. Some coaches are drawn by horses...
ALL trains are 'articulated' in some way or another, assuming that they consist of more than one vehicle. The TYPE of 'articulation' is the point here. As far as passenger rolling stock is concerned, 'articulation' refers to the mounting of the ends of two underframes on a shared bogie. This is what is meant by 'articulated', and to use the word for any other form of 'articulation' without specifying that fact can only lead to confusion. So it's best not to.
S-stock gangways are remarkably wide; that's how they differ. I was only used to seeing such wide gangways on articulated stock using the Tyneside loop. That is why I first of all believed the S-stock to be articulated. I was amazed to find that it was not; and was shown (on here) the diagrams which prove this.
Americans refer to goods wagons as 'cars'. The term is not specific to passenger stock. Main-line railways use 'car' as an abbreviation in 'internal' docs, such as working timetables &c., but seldom when addressing the passenger. It ought to be noted that 'car' in Underground terms refers only to American style carriages with multiple seats in a saloon. Main-line types, such as the Dreadnoughts, were not, and ought not to be referred to as such.
I take it the DLR hasn't placed any withdrawn carriages on the 'duplicate' list, in case of demand outstripping growth? Does nobody learn any more?
Whilst it would be prudent to do so on lines with spare capacity (a lesson Beeching didn't understand), there would be little point in maintaining rolling stock to meet demand unless there is spare capacity on the infrastructure on which to run them.
In any case, the only DLR rolling stock withdrawn so far have been the 21 units of P86 and P89 stock, which were unsuitable for the tunnel sections*. All of them have found further use elsewhere.
*The P89 stock was fireproofed for use on the Bank extension, but because of the lack of end doors they may not operate in tunnels except as single units.
I was referring to this statement mentioned in the link:
"The DLR is seeing annual growth around 8% yet no additional trains are expected until 2022, as covered here..."
Which suggests that extra stock, not capacity, is the problem.