On Sat, 08 May 2021 10:40:53 +0100
Charles Ellson wrote:
On Sat, 8 May 2021 09:15:17 +0000 (UTC),
wrote:

On Fri, 07 May 2021 23:35:23 +0100
Charles Ellson wrote:
On Wed, 5 May 2021 08:32:03 +0000 (UTC),
wrote:
The doors are meant to be a safety feature. I'm not sure a safety feature
that

led to even more crush loading in a station would be signed off. In case
you hadn't noticed all the JLE stations have huge platform areas.

Platform doors on the Underground are part of the environmental
control of more recent tube sections; increased safety is a secondary

Rubbish.

Rubbish yourself.
"one of the main reasons (and justifications) for having
PEDs is for ventilation although of course they do have the obvious
benefit of preventing people from falling onto the track."
https://www.whatdotheyknow.com/reque...m_screen_doors

No idea what that site is , but clearly neither them nor you have ever
been on the tube. The piston effect of the train pulling and pushing air
through the tunnel provides plenty of ventilation into the station. In fact
the doors actually prevent a lot of that leaving some station platforms
uncomfortable on hot days IME when I worked at Canary Wharf particularly
London Bridge.

On Sat, 8 May 2021 10:26:15 +0000 (UTC),
wrote:

On Sat, 08 May 2021 10:40:53 +0100
Charles Ellson wrote:

Rubbish yourself.
"one of the main reasons (and justifications) for having
PEDs is for ventilation although of course they do have the obvious
benefit of preventing people from falling onto the track."
https://www.whatdotheyknow.com/reque...m_screen_doors

No idea what that site is

Might I suggest that you follow the link and read the documents on the
other end of it, then. It might help you stop looking like an idiot.

, but clearly neither them nor you have ever
been on the tube.

It would be a little odd if nobody from TfL had ever been on the tube.

Mark

On Sat, 08 May 2021 12:11:37 +0100
Mark Goodge wrote:
On Sat, 8 May 2021 10:26:15 +0000 (UTC),
wrote:

On Sat, 08 May 2021 10:40:53 +0100
Charles Ellson wrote:

Rubbish yourself.
"one of the main reasons (and justifications) for having
PEDs is for ventilation although of course they do have the obvious
benefit of preventing people from falling onto the track."
https://www.whatdotheyknow.com/reque...m_screen_doors

No idea what that site is

Might I suggest that you follow the link and read the documents on the
other end of it, then. It might help you stop looking like an idiot.

They can claim what they like, but back when the JLE was being built the
safety case of platform doors was being pushed by LU in the media. Ventilation
didn't even get a mention.

, but clearly neither them nor you have ever
been on the tube.

It would be a little odd if nobody from TfL had ever been on the tube.

So Ellson works for TfL?

On Sat, 8 May 2021 15:42:45 +0000 (UTC),
wrote:

On Sat, 08 May 2021 12:11:37 +0100
Mark Goodge wrote:
On Sat, 8 May 2021 10:26:15 +0000 (UTC),
wrote:

On Sat, 08 May 2021 10:40:53 +0100
Charles Ellson wrote:

Rubbish yourself.
"one of the main reasons (and justifications) for having
PEDs is for ventilation although of course they do have the obvious
benefit of preventing people from falling onto the track."
https://www.whatdotheyknow.com/reque...m_screen_doors

No idea what that site is

Might I suggest that you follow the link and read the documents on the
other end of it, then. It might help you stop looking like an idiot.

They can claim what they like, but back when the JLE was being built the
safety case of platform doors was being pushed by LU in the media. Ventilation
didn't even get a mention.

, but clearly neither them nor you have ever
been on the tube.

It would be a little odd if nobody from TfL had ever been on the tube.

So Ellson works for TfL?

Try doing what he suggested, Fudrick.

wrote:
On Sat, 08 May 2021 10:40:53 +0100
Charles Ellson wrote:
On Sat, 8 May 2021 09:15:17 +0000 (UTC),
wrote:

Rubbish.

Rubbish yourself.
"one of the main reasons (and justifications) for having
PEDs is for ventilation although of course they do have the obvious
benefit of preventing people from falling onto the track."
https://www.whatdotheyknow.com/reque...m_screen_doors

No idea what that site is ,

It's the official site where Freedom Of Information (FOI) requests are
handled.

but clearly neither them nor you have ever
been on the tube. The piston effect of the train pulling and pushing air
through the tunnel provides plenty of ventilation into the station. In fact
the doors actually prevent a lot of that leaving some station platforms
uncomfortable on hot days IME when I worked at Canary Wharf particularly
London Bridge.


The piston effect of the trains pumps hot air around the tunnels from one
station to another, great.

If you visit very hot places like Singapore or Hong Kong you'll find that
almost every underground metro station has full-height platform edge doors
which completely isolate the air in the tunnels from the air in the
platforms. You can then have air-conditioned trains and platforms (both
nice and cool); as you step from train to platform or vv. you can feel a
layer of very hot tunnel air as you step through it (like those heaters
above shop doorways which used to be popular).

Used properly, it can be very effective.


Anna Noyd-Dryver

On Sat, 8 May 2021 12:32:05 -0000 (UTC)
Anna Noyd-Dryver wrote:
wrote:
through the tunnel provides plenty of ventilation into the station. In fact
the doors actually prevent a lot of that leaving some station platforms
uncomfortable on hot days IME when I worked at Canary Wharf particularly
London Bridge.


The piston effect of the trains pumps hot air around the tunnels from one
station to another, great.

No, it pushes some of the hot air out of the station and draws some cold
air in. Next time you're at Holborn stand at the top of the escalators and
you'll see what I mean. No idea why the effect is so strong at that station,
perhaps fewer ventilation shafts.

If you visit very hot places like Singapore or Hong Kong you'll find that
almost every underground metro station has full-height platform edge doors
which completely isolate the air in the tunnels from the air in the

And LU doesn't. What does that tell you?

Used properly, it can be very effective.

No doubt. The LU system isn't very effective at it, but it is effective at
stopping people falling on the track. I imagine the reason its not on the
above ground sections of the JLE is that the mechanisms arn't built to
withstand the elements and there'd be constant failures.

wrote:
On Sat, 8 May 2021 12:32:05 -0000 (UTC)
Anna Noyd-Dryver wrote:
wrote:
through the tunnel provides plenty of ventilation into the station. In fact
the doors actually prevent a lot of that leaving some station platforms
uncomfortable on hot days IME when I worked at Canary Wharf particularly
London Bridge.


The piston effect of the trains pumps hot air around the tunnels from one
station to another, great.

No, it pushes some of the hot air out of the station and draws some cold
air in. Next time you're at Holborn stand at the top of the escalators and
you'll see what I mean. No idea why the effect is so strong at that station,
perhaps fewer ventilation shafts.

If you visit very hot places like Singapore or Hong Kong you'll find that
almost every underground metro station has full-height platform edge doors
which completely isolate the air in the tunnels from the air in the

And LU doesn't. What does that tell you?

Used properly, it can be very effective.

No doubt. The LU system isn't very effective at it, but it is effective at
stopping people falling on the track. I imagine the reason its not on the
above ground sections of the JLE is that the mechanisms arn't built to
withstand the elements and there'd be constant failures.



As I posted last time we discussed this topic, several systems worldwide
have platform edge doors (half height and full height) on open platforms.


Anna Noyd-Dryver

On 08/05/2021 18:05, Anna Noyd-Dryver wrote:
wrote:
On Sat, 8 May 2021 12:32:05 -0000 (UTC)
Anna Noyd-Dryver wrote:
wrote:
through the tunnel provides plenty of ventilation into the station. In fact
the doors actually prevent a lot of that leaving some station platforms
uncomfortable on hot days IME when I worked at Canary Wharf particularly
London Bridge.


The piston effect of the trains pumps hot air around the tunnels from one
station to another, great.

No, it pushes some of the hot air out of the station and draws some cold
air in. Next time you're at Holborn stand at the top of the escalators and
you'll see what I mean. No idea why the effect is so strong at that station,
perhaps fewer ventilation shafts.

If you visit very hot places like Singapore or Hong Kong you'll find that
almost every underground metro station has full-height platform edge doors
which completely isolate the air in the tunnels from the air in the

And LU doesn't. What does that tell you?

Used properly, it can be very effective.

No doubt. The LU system isn't very effective at it, but it is effective at
stopping people falling on the track. I imagine the reason its not on the
above ground sections of the JLE is that the mechanisms arn't built to
withstand the elements and there'd be constant failures.



As I posted last time we discussed this topic, several systems worldwide
have platform edge doors (half height and full height) on open platforms.


Anna Noyd-Dryver

St. Petersburg, Tokyo, Brescia, Copenhagen, Paris Metro Lines 1 and 14
etc.

On Sat, 8 May 2021 17:05:19 -0000 (UTC)
Anna Noyd-Dryver wrote:
wrote:
No doubt. The LU system isn't very effective at it, but it is effective at
stopping people falling on the track. I imagine the reason its not on the
above ground sections of the JLE is that the mechanisms arn't built to
withstand the elements and there'd be constant failures.



As I posted last time we discussed this topic, several systems worldwide
have platform edge doors (half height and full height) on open platforms.

And I bet those half height doors really work wonders for ventilation, right?

wrote:
On Sat, 8 May 2021 17:05:19 -0000 (UTC)
Anna Noyd-Dryver wrote:
wrote:
No doubt. The LU system isn't very effective at it, but it is effective at
stopping people falling on the track. I imagine the reason its not on the
above ground sections of the JLE is that the mechanisms arn't built to
withstand the elements and there'd be constant failures.



As I posted last time we discussed this topic, several systems worldwide
have platform edge doors (half height and full height) on open platforms.

And I bet those half height doors really work wonders for ventilation, right?




If it's an outdoor station then ventilation clearly isn't the purpose of
the PEDs in that instance *rollseyes*


Anna Noyd-Dryver