Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jun 17, 2016 13:19:30 GMT
When travelling on the northbound Piccadilly Line, there is a fairly long gap between Manor House and Turnpike Lane. At around the halfway point, there is always a sudden burst of wind accompanied by a faint cloud of dust blown through the train. This is especially noticeable if you're travelling in the first car. It feels like the train has just burst a large air bubble.
Does anyone know the cause of this?
I've noticed it many times (literally hundreds of occasions, since I live at Wood Green) and it is very consistent. Every time it happens I think I must ask someone, but always forget. So I'm finally asking!
|
|
|
Post by Jerome H on Jun 17, 2016 13:41:18 GMT
Is there a ventilation shaft somewhere in that section? That's all I can think of.
|
|
|
Post by norbitonflyer on Jun 17, 2016 13:49:49 GMT
|
|
class411
Operations: Normal
Posts: 2,718
|
Post by class411 on Jun 17, 2016 14:07:41 GMT
As the train approaches the ventilation shaft the pressure in front of it will decrease as there is a path for the air it is pushing. This will cause any currents of air in the train to gradually decrease until it passes the shaft, at which point the pressure will rapidly increase, causing a noticeable change in air currents.
Interesting about the dust, though.
I don't think I've ever noticed a dust cloud in an underground train.
|
|
|
Post by phoenixcronin on Jun 17, 2016 14:24:27 GMT
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jun 17, 2016 14:59:45 GMT
Thanks everyone, it looks like the mystery that bugged me for years has been solved! The sudden increase in air pressure after the ventilation shaft explains everything.
You do have to be sitting behind the front cabin to actually see the dust in the air, but the wind burst is noticeable throughout the train.
I love the stories from 2014, especially that even after someone screamed in terror, nobody else said a word to each other. The London Code must be upheld at all times.
|
|
class411
Operations: Normal
Posts: 2,718
|
Post by class411 on Jun 17, 2016 15:08:56 GMT
I love the stories from 2014, especially that even after someone screamed in terror, nobody else said a word to each other. The London Code must be upheld at all times. That reminds me of a Victoria Wood tale (made up, of course, but I thought it was hilarious, nonetheless). Two people start to have passionate sex on a crowded commuter train.
Nobody says a single word.
Afterwards, wallowing in post coital bliss, they light up a cigarette each.
Immediately, someone pipes up: "Excuse me, but I think you'll find this is a non-smoking compartment".
|
|
|
Post by stapler on Jun 17, 2016 15:23:40 GMT
Class 411, just indicates that VW hadn't travelled on the tube since 1985!
|
|
class411
Operations: Normal
Posts: 2,718
|
Post by class411 on Jun 17, 2016 16:26:06 GMT
Class 411, just indicates that VW hadn't travelled on the tube since 1985! She didn't specify it was the underground.
|
|
|
Post by shunterl44 on Jun 21, 2016 15:31:42 GMT
Not sure about the dust but you get a similar effect passing the site of the old Down Street station - eastbound in particular.
|
|
|
Post by bassmike on Jun 23, 2016 11:34:29 GMT
The biggest windburst between Manor house and Turnpike lane was subsequent to an acquaintance of mine visiting the "Bengazhi Karsie " restaurant at Manor house.
|
|
|
Post by philthetube on Jun 23, 2016 17:15:18 GMT
you can occasionally see clouds of dust anywhere on the system , especially after engineering work, I am surprised that dust remains in the same area though.
When working as a guard on the northern line many years ago, in the days of white shirts, there was no question of going out after work without having a shower first, the water used to be black around your feet and when you blew your nose there was no trace of green for all the black. It is a lot less dusty now because of different braking systems.
|
|