Yes, and the fact that none of the windows open. This is crazy! The
only stock with opening windows is the A60 and D78 - the more modern
stock does not (except a small bit of the end-doors).

Admit defeat on this one - don't know why. Suspect the nanny state over
the years.
Haven't looked, but do the refurbished D78s have opening windows ? And
I can't remember whether the Pic '72s had them before their
refurbishment. If so we can approximately date the likely change in
standards.


It seems pure madness to have double-glazing throughout, for example,
on the C69/77 stock (Circle Line etc.) which is PURELY to house the
doors when they are open! More modern stock, e.g. 1992 stock on
Northern Line at least has the doors opening oustide the body, so no
double-glazing needed, but why did they not devise opening windows for
that stock?

They are not double glazed, there are two panes of glass :O)
Not as daft as it sounds, there is no seal and quite some airflow, and
the temperature of the air in the cavity is effectively the same as the
outside.

The trend to outside hung doors has more to do with the gaining of a
couple of inches of space ...