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#1
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![]() After another grim morning on Friday, I wonder why the ventilation on the Victoria Line is so bad ? If you change to the Piccadilly at Finsbury Park it's like entering a different world. So if the Picc Line can stay reasonably fresh why can't the Vic Line ? Even with the trains at full hurtle little air seems to move about the carriage. -- Edward Cowling Stop Thatcher's State Funeral http://petitions.pm.gov.uk/thatchfuneral/ |
#2
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Edward Cowling London UK wrote:
After another grim morning on Friday, I wonder why the ventilation on the Victoria Line is so bad ? If you change to the Piccadilly at Finsbury Park it's like entering a different world. So if the Picc Line can stay reasonably fresh why can't the Vic Line ? Even with the trains at full hurtle little air seems to move about the carriage. The Victoria Line is completely underground, except for the depot. The Picc has several open air sections. |
#3
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On 9 Aug, 14:22, "John Rowland"
wrote: Edward Cowling London UK wrote: After another grim morning on Friday, I wonder why the ventilation on the Victoria Line is so bad ? If you change to the Piccadilly at Finsbury Park it's like entering a different world. So if the Picc Line can stay reasonably fresh why can't the Vic Line ? Even with the trains at full hurtle little air seems to move about the carriage. The Victoria Line is completely underground, except for the depot. The Picc has several open air sections. Except that 5 miles inside the tunnel that shouldn't make any difference. In hot weather the trains sit and bake in the sun when outside so they're probably hotter than a vic train when they enter it. My guess would be the very high service level on the vic. You can wait at finsbury park and sometimes literally 4 vic trains can go by for 1 piccadilly. B2003 |
#4
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In message
, Boltar writes On 9 Aug, 14:22, "John Rowland" wrote: Edward Cowling London UK wrote: After another grim morning on Friday, I wonder why the ventilation on the Victoria Line is so bad ? If you change to the Piccadilly at Finsbury Park it's like entering a different world. So if the Picc Line can stay reasonably fresh why can't the Vic Line ? Even with the trains at full hurtle little air seems to move about the carriage. The Victoria Line is completely underground, except for the depot. The Picc has several open air sections. Except that 5 miles inside the tunnel that shouldn't make any difference. In hot weather the trains sit and bake in the sun when outside so they're probably hotter than a vic train when they enter it. My guess would be the very high service level on the vic. You can wait at finsbury park and sometimes literally 4 vic trains can go by for 1 piccadilly. I have found myself taking the longer Picc Line route on hot days. Not only because it's cooler, but the trains tend to wait in the station if there are delays rather than in the tunnel. You can see that "oh hell" look on peoples faces when a Victoria Line train stops in a tunnel. -- Edward Cowling Stop Thatcher's State Funeral http://petitions.pm.gov.uk/thatchfuneral/ |
#5
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In message , John Rowland
writes Edward Cowling London UK wrote: After another grim morning on Friday, I wonder why the ventilation on the Victoria Line is so bad ? If you change to the Piccadilly at Finsbury Park it's like entering a different world. So if the Picc Line can stay reasonably fresh why can't the Vic Line ? Even with the trains at full hurtle little air seems to move about the carriage. The Victoria Line is completely underground, except for the depot. The Picc has several open air sections. Which makes it sound unlikely the refurb and new trains will help. -- Edward Cowling Stop Thatcher's State Funeral http://petitions.pm.gov.uk/thatchfuneral/ |
#6
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On Sat, 9 Aug 2008, Edward Cowling London UK wrote:
In message , John Rowland writes Edward Cowling London UK wrote: After another grim morning on Friday, I wonder why the ventilation on the Victoria Line is so bad ? If you change to the Piccadilly at Finsbury Park it's like entering a different world. So if the Picc Line can stay reasonably fresh why can't the Vic Line ? Even with the trains at full hurtle little air seems to move about the carriage. The Victoria Line is completely underground, except for the depot. The Picc has several open air sections. Which makes it sound unlikely the refurb and new trains will help. They should do. Firstly, they'll have regenerative braking, which means less of the train's kinetic energy will be turned into heat, so the tunnels won't get as hot in the first place. Secondly, i understand they've been designed with better ventilation: what matters is the temperature on board the train, and this has got as much to do with airflow between the train and tunnel as with the temperature in the tunnel itself. I posted a link to a paper on some research about this a few weeks ago; i don't have it to hand, but i seem to remember that better ventilation could buy a few degrees of coolness. tom -- What we learn about is not nature itself, but nature exposed to our methods of questioning. -- Werner Heisenberg |
#7
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On Sun, 10 Aug 2008, Tom Anderson wrote:
On Sat, 9 Aug 2008, Edward Cowling London UK wrote: In message , John Rowland writes Edward Cowling London UK wrote: After another grim morning on Friday, I wonder why the ventilation on the Victoria Line is so bad ? If you change to the Piccadilly at Finsbury Park it's like entering a different world. So if the Picc Line can stay reasonably fresh why can't the Vic Line ? Even with the trains at full hurtle little air seems to move about the carriage. The Victoria Line is completely underground, except for the depot. The Picc has several open air sections. Which makes it sound unlikely the refurb and new trains will help. They should do. Firstly, they'll have regenerative braking, which means less of the train's kinetic energy will be turned into heat, so the tunnels won't get as hot in the first place. Secondly, i understand they've been designed with better ventilation: what matters is the temperature on board the train, and this has got as much to do with airflow between the train and tunnel as with the temperature in the tunnel itself. I posted a link to a paper on some research about this a few weeks ago; i don't have it to hand, but i seem to remember that better ventilation could buy a few degrees of coolness. This might be of interest - it confirms the regenerative braking and improved ventilation: http://www.metronetrail.com/default....=1181842039781 tom -- What we learn about is not nature itself, but nature exposed to our methods of questioning. -- Werner Heisenberg |
#8
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Edward Cowling London UK wrote:
In message , John Rowland writes Edward Cowling London UK wrote: After another grim morning on Friday, I wonder why the ventilation on the Victoria Line is so bad ? If you change to the Piccadilly at Finsbury Park it's like entering a different world. So if the Picc Line can stay reasonably fresh why can't the Vic Line ? Even with the trains at full hurtle little air seems to move about the carriage. The Victoria Line is completely underground, except for the depot. The Picc has several open air sections. Which makes it sound unlikely the refurb and new trains will help. I think the Picc's 73 stock has the best ventilation system on the Underground currently. Hopefully the new Victoria Line stock will be even better. I know they've done a lot of work to improve ventilation in the new design. Time will tell ... -- Richard J. (to email me, swap 'uk' and 'yon' in address) |
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