Tom Anderson wrote in message ...
"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?"

Pressurised air in the brake pipes or tanks moving about?
Sound of the brake pads on rubbing on the discs?
Anything else that can produce a kind of white noise sound really

B2003