Riding on the Berlin u-bahn and s-bahn last month in temperatures
comparable to today revealed little passenger discomfort since the cars
all have proper opening hinged side windows. So far wide do they open
that pictorgrams forbid the throwing out of bottles and cans, which is
probably why nanny state Britain would forbid us from having them here.
The D Stock were saunas when first introduced in comparison with the R
and CO/CP stock they replaced and until opening windows were
retro-fitted. Doubtless the awful S-stock planned to replace them will
be likewise until air-con is fitted.