No trousers day

[chilpaul]

Here you go .....

https://londonist.com/london/transport/ ... nuary-2023

[Coder]

*shudder* so glad I don't have to ride any sort of subway, like ever, but especially that day.

[Barleymower]

Strictly pants by the look of it.

[moonshadow]

It seems this would be more practical in the summer time.

[rode_kater]

It seems this would be more practical in the summer time.

This is the London underground they're talking about. There's 150 years of accumulated heat there. As long as they don't go to any outdoor stations they'll be fine.

[r.m.anderson]

It seems this would be more practical in the summer time.

This is the London underground they're talking about. There's 150 years of accumulated heat there. As long as they don't go to any outdoor stations they'll be fine.

You mean the London underground has no ventilation !?!
Horrors !
What would Marilyn do not having her dress embellished by the air flow topside ?

[rode_kater]

"
You mean the London underground has no ventilation !?!

Now you made me look it up. It's actually quite interesting. From wikipedia:

In the original Tube design, trains passing through close fitting tunnels act as pistons to create air pressure gradients between stations. This pressure difference drives ventilation between platforms and the surface exits through the passenger foot network. This system depends on adequate cross-sectional area of the airspace above the passengers’ heads in the foot tunnels and escalators, where laminar airflow is proportional to the fourth power of the radius, the Hagen–Poiseuille equation. It also depends on an absence of turbulence in the tunnel headspace. In many stations the ventilation system is now ineffective because of alterations that reduce tunnel diameters and increase turbulence. An example is Green Park tube station, where false ceiling panels attached to metal frames have been installed that reduce the above-head airspace diameter by more than half in many parts. This has the effect of reducing laminar airflow by 94%.

So it's one of those "it worked in the original design and after 150 years of changes it now doesn't work any more" things.

[Pdxfashionpioneer]

It is amazing how often modern “improvements” destroy ingenious, energy-efficient designs.

As to the day itself; I hope the word of this doesn’t get out or Portland, Oregonians will insist on putting more of our light rail system underground.

[STEVIE]

What would Marilyn do not having her dress embellished by the air flow topside ?

In London, that would never have occurred in the first place.
The airshafts there appear to have taken the form of chimneys and by the photos some architectural gems too.
Chimney?

[trainspotter48]

I understand that another 'trick' for hiding a ventilation shaft is to pass it up through a building. There is a series of TV programmes (presented by Tim Dunn and Siddy Holloway) about the London Underground that have most recently been shown on the 'Yesterday' channel in the UK. If you have an interest in underground railways they can be well worth watching. The first line actually used coke burning steam locomotives!!