http://www.bbc.co.uk/news/uk-england-london-29520761

I distinctly remember arguing on this group a few years back with someone
saying that walk through tube trains would be impossible because of [insert
nonsense reason about loading gauge here]. Good thing for them I can't remember
who it was and I'm too lazy to go through the archives otherwise there would be
a serious session of I Told You So right now.

--
Spud