Anon wrote:

Finally it has not yet been made public what caused the incident in
the first place.

If you are referring to the Camden Town derailment, the final report was
published on 2 Feb 2004. See the LU press release at
http://tube.tfl.gov.uk/content/press...es/0402/02.asp

"The derailment can be explained by a rare combination of a design
weakness in the points on which it happened and a number of other
factors. ... The design weakness meant that a derailment could occur
when the type of switchblade used at Camden Town 20B points was
installed:

- in facing points; and
- the track leading into the points was sharply curved; and
- the switchblade was not significantly worn; and
- friction levels between wheels and rails were high, then
- wheels tended to climb over the switchblade.
- All of these conditions applied at Camden Town. ...
A revised switchblade design, that eliminates the weakness that led to
the derailment, is now being refined and validated before being
introduced."

There was also an issue with the adjustment of the first bogie that
derailed, which made it less tolerant to the unusual conditions at 20B
points.

--
Richard J.
(to e-mail me, swap uk and yon in address)