Having now read the article in Captain Deltic's Monthly, I've got to
say that some comments here are perhaps a little too critical of MR's
crucading editorial staff.

They are, yes a little vague in what they are saying, but it is clear
that they are not saying that the DLR is proposing to build onwards
from the existing Bank Terminus to CX. What they are saying is that
DLR are floating the proposal of an additional terminus at CX,
utilising where possible the protected Fleet line tunnel wayleve, and
the unused ex Jubilee station at CX.

Now hell knows what the issue is here with structure gauge, but MR are
only making the point that the cost of underground lines tends to be in
the stations, there is therefor the suggestion that this new branch
would have no intermediate stations. Ie the trains would run non-stop
from Shadwell to CX.