On 25 Apr 2007 05:57:14 -0700, Steve wrote:

This morning I took the Bakerloo southbound from Waterloo, and noticed
that the route maps opposite the platforms appeared to have been
blanked off after Elephant & Castle, suggesting truncation of the
line. A little research reveals various plans for southern extensions
over the years, but with very little having happened on the ground
apart from what became glorified headshunts at Elephant & Castle. It
seems strange, therefore, that maps were put in place for these
extensions before the tunnels were dug - unless the maps had to be
replaced for other reasons and the blanking panels were designed for
later removal.

That's probably the reason. As discussed in a previous thread in
u.t.l, line diagrams that have been replaced at Piccadilly Line
stations in the last couple of years during station refurbishments
already show the Heathrow T5 extension (and in most cases it isn't
even covered up).

Pic:
http://en.wikipedia.org/wiki/Image:P..._Extension.JPG