On Thu, 5 Jul 2007, Boltar wrote:

On 5 Jul, 14:09, "Recliner" wrote:

Am I right in thinking that 1992 stock has smaller wheels than other
Tube trains and is perhaps more likely to derail when it encounters
something on the track?

It does seem strange that a heavy train could become derailed by
something light enough to have become dislodged by vibration or air
movements and apparently flap around in the wind.

If this light flappy thing made its way onto the line, it's possible other
things did too. For instance, if there had been a pile of crowbars wrapped
in a tea-towel (or something more plausible to that effect), and that had
fallen onto the track.

tom

--
It not infrequently happens that something about the earth, about the sky,
about other elements of this world, about the motion and rotation or even
the magnitude and distances of the stars, about definite eclipses of the
sun and moon, about the passage of years and seasons, about the nature
of animals, of fruits, of stones, and of other such things, may be known
with the greatest certainty by reasoning or by experience. -- St Augustine