Roland Perry wrote:
In message , at 22:48:37 on Fri, 15 Nov
2019, Bryan Morris remarked:
In message , Roland Perry
writes
In message , at 20:41:41 on Fri, 15 Nov
2019, remarked:
On Fri, 15 Nov 2019 15:17:03 +0000
Roland Perry wrote:
In message , at 14:24:18 on Fri, 15 Nov
2019, Bryan Morris remarked:

I find the Picc unbearably deep, so by the time I've reached Barons
Court (westbound) I'm standing by the door gasping for fresh air. No
other tunnel affects me like that, not even the Chunnel.

I thought the Northern Line Edgware Branch was deepest. I know when I
used to travel via Hampstead/Golders Green my ears used to pop.

That's the deepest under the surface, but the surface is a hill! Air
pressure on the surface there will be lower as a result, by about 2.5%

I think the deepest below sea level (from memory) is the Jubilee between
Westminster and Waterloo.

Later: Hampstead Station is approx 200m above sea level at the surface,
140m above sea level at the platform.

Not it isn't. The highest point of the heath which is well above the tube
station is 134m. I'm guessing the station entrance is around 80-90m.

That's what one gets for looking things up at what turns out to be an
unreliable source. I still believe that the platforms are 60m below
the surface, which a more reliable source puts at 376ft (ie 115m).

Hampstead is on a steep hill and the station platforms are the deepest
on the London Underground network, at 58.5 metres (192 ft) below ground
level. It has the deepest lift shaft on the Underground at 55 metres
(180 ft) which houses high-speed lifts.
Source https://en.wikipedia.org/wiki/Hampstead_tube_station

Indeed, but if the earlier poster was having difficulty breathing due to
depth, it could be attributed to air pressure, which is a factor of
sea-level, not depth from the surface. However as the effect is less
than 1% at such depths, perhaps it's claustrophobia or air pollution
that's really the issue. In which case the tube lines are more prone to
those than the DLR.

Yes, it sounds moreÂ*like claustrophobia than air pressure. But I don't
think the 73TS is any more claustrophobic than any other current Tube
stock, so I don't know why that line should be different to, say, the
Bakerloo line, whose trains have a similar mid 1970s ambience. And, apart
from the twisty section just east of South Ken, the Piccadilly line tunnels
aren't as noisy as, say, the Northern or JLE.