Excuse me for hijacking this thread, but it is the perfect moment to ask a
thing I always wanted to know:

What are the PED built for?
Obviously, they are a safety increase for the passengers on a crowded
platform - but in a movie of a "jubilee line drivers view" I saw, the
speaker said something about the ventilation systems of the trains. He
emphasized that the ventilation was the primary reason for building them,
and safety came just along with that.

So I wonder if someone can give some insights what the doors really do for
the line - or if this DVDs commentary is just b...

--
Ralf (from Germany)
- flying to London next week for 3 days holiday in the city
- looking forward (I really do) to use the tube!