"Yes - the end windows open on London Underground cars."
A sign says 'To increase ventilation lower this window'.
This gives me an excuse to post the fact that currently on the London Underground website there is an interesting press release about "air cooling" - they don't call it air-conditioning - on the London Underground, which notoriously doesn't have a/c on the trains. See:
http://tube.tfl.gov.uk/content/pressreleases/0407/15.asp
A year ago, Mayor Ken Livingstone issued a challenge to people to come up with ideas for workable ways of cooling London Underground trains. Apparently there have been 3,400 responses!