Interesting; didn't know that about Waterloo.
As you say,
infrasound* has been demonstrated to (possibly) cause precisely such effects on humans in the London Underground environment. It's touched upon in this very watchable documentary (apologies if you've all seen this before - which seems quite likely, ho ho )
NB. NOT to be confused with one of those Derek Acorah things.
For those who haven't, some of the spooky anecdotes are quite alarming! The first is pure modern-day MR James.
*see about 10:20 and 18:00. Mind you, like millions of people I've been all over the tube network under all sorts of circumstances and never felt any sudden feelings of inexplicable dread.
Edit: Having watched the documentary again with a skeptical eye I notice an apparent contradiction: comparing the 'white overalls' story with the 'little old lady' one it seems highly suggestive that in the first case the former ghostly/stone tape recording/interdimensional or whatever apparition is unseen to the naked eye but clearly seen on CCTV, yet the latter quite the reverse. It's a bit late at night to begin grasping towards conclusions, but to my mind this suggests that either there are different phenomena going on, or that the phenomena will interact with us and manifest in a variety of changing ways in our world...or that these are merely reports of perceptual glitches, false memories, hallucinations or just tall stories.
Do watch the film if you're in that sort of mood though - it's excellent fun and beautifully shot and edited.
It is an excellent documentary, and the most fascinating story concerned a trainee walking the tunnels at night and meeting an old man with whom he had a short chat before going on. After seeing it I spoke about it with my wife's cousin Ray, who worked a long time on the tube (he has now retired). He commented that he knew the witness personally, and that something similar had happened to him as well! Here is a summary that I wrote down for someone else:
Unfortunately my wife's cousin can't recall a lot of details regarding his strange
encounter on the London Underground, so I asked him to give me the major details
over the phone.
Ray Beach was at that time, in the early 1980s, working as a train driver at
Baker Street. Early one morning he was preparing to take a train out of its sidings
tunnel on the Central Line, between Farringdon and Barbican stations, directly under
the Smithfield Meat Market.
The train was bitterly cold (although Ray doesn't think it was the winter) and
as he walked through the train heading for the driver's cab he met a line worker, "A
black guy in overalls, carrying a Tilley lamp," coming the other way. They said
"hello" to each other as they passed. Ray thought it very strange that a "permanent way
operator" would be working at that time, and when he got to his cab he asked his
Guard, via the intercom, "Did that P way guy get off?"
Of course, the Guard had no idea what he was talking about, and nobody had
passed him to leave the train at the back.
A similar kind of case, featuring another man carrying an old-fashioned lamp,
was mentioned on the TV documentary I mentioned. That case involved a trainee
manager walking the line at night (London Underground have the sensible idea that all
managerial staff should experience all work activities at first hand). He met a normal
looking man and had a conversation with him before proceeding on his way. Later
when he mentioned his meeting there was concern that someone had got onto the line
without permission and a search had to be made! His line manager refused to believe
that he hadn't heard stories of the ghost of a line worker who had been killed by a
train.
I can vouch for Ray being a very solid, unimaginative guy. He started out at the bottom and worked his way up to being duty manager at Kings Cross for some years after the fire there.