On Thursday, October 9, 2014 12:22:46 PM UTC-4, wrote:
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.

I thought that TfL had considered walk-through for the 2009 stock on the Victoria line, but rejected it as impractical.

AIUI, this proposed new stock is not intended to replace the 2009 stock.
--
Roy