On Sun, 1 Jul 2007 20:33 +0100 (BST), Colin Rosenstiel wrote:

Between 1945 and 2000, with the exception of the
absolutely-necessary-to-avoid-gridlock Victoria Line, the
half-arsed-compromise Jubilee Line, and the
Thatcher's-Docklands-project-must-succeed-or-else JLE, there was no
investment in the Underground system. None.

Oblox! For example, you have ignored the investment in rolling stock
which covered the entire fleet in that period, some twice (e.g. most of
the District stock).

I know for a fact that the District signalling was replaced in the
1950s/60s too.

That's just maintenance and renewals though, which is in a different
category from investment in new infrastructure (which I think is what
the PP meant).