On 23/11/2011 11:41, Tim Lamb wrote:
I believe there is a plan afoot to extend the Two tracks South of
Cambridge to four at some stage...

Yes.

I am anticipating interesting times with the disposal of soils arising
from the tunnelling either side of Digswell.


Wikipedia doesn't have any dirt on Digswell so what is the problem with
the ground around Digswell?

Buncefield did cross my mind but that is Hemel Hempstead rather than
Welwyn Garden City.
--
Roger Chapman