On Wed, 17 Nov 2004 16:42:17 +0000, Tom Anderson wrote:

Hi all,

There's a London-oriented email newsletter thing called London by London;
it's like Notes & Queries in structure, with people asking questions and
other people answering them. This one doesn't have an answer yet, so i
thought i'd pass it on:

"Your post reminded me to ask the LBL readership (is it really 10,000
strong?) if anyone has heard another noise made by jubilee line trains. I
can only describe the noise as the sound of running water. It's as if
you're the other side of a very thin wall and someone's just flushed the
loo in the next room. The noise seems to travel from one end of the
carriage to the other and yet no one on the carriage bats an eyelid at
this seemingly (super-) natural sound. Has anyone else heard it and do
they know what it is?"



The noise you describe is indeed running water, the 96' stock, like all
the modern stock on the underground, is fabricated from an extruded
aluminium body with a plastic inner shell that forms the interior of the
carraige. There is a space between this shell and the actual body of the
train to accommodate the air ventilation and wiring for the lights
and other systems.

On some cariages the roof has not been sealed properly and rain water has
seeped into this space, this is what you hear moving about when the train
is moving and braking.

Chris


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