In that media piece, the fully enclosed metro stations were rated the least
affected by fallout - understandably. The only opportunity to be subject to
train fallout would be the period the gates are open and that's a very
tight gap.

Tony P

On Monday 26 February 2024 at 13:54:00 UTC+11peterm...@... wrote:

> Matthew,

>

> I agree its a dust and dirt trap, the major drivers will be "aesthetics"

> no 1 and no 2 acoustics, the latter gaps and openings to cavities behind

> that are damped are very common control of acoustic behaviour of a space,

> but having dealt with problems down the track the pull the acoustic traps

> apart and cleaned the dust and crap out of them is not well received by

> facility owners. The acoustic traps collect junk dust and everything that

> goes by.. They diminish in performance the more clogged with crap they are

> and eventually need a clean. Messy process in deed as you have indicated.

>

> This arrangement should prevent the carbon " dust" in the platform that

> has been reported recently in Metro and ST underground, carbon gosh i

> wonder where, oh yeh pantographs!!! look at 2107 Matthew we know it only

> too well.....

>

> Thanks

> Peter

> On Sunday 25 February 2024 at 19:02:31 UTC+11 Matthew Geier wrote:

>

>>

>> On 25/2/24 18:19, TP wrote:

>>

>> There are no horizontal covers over the running tracks. I know the design

>> you mean, but these (and afaik on all Sydney metro stations that have full

>> height PSDs) are vertical walls. There should be very little dust fallout

>> in these public areas. The platforms are completely screened from the

>> trains, so there would be little infiltration of train brake, pantograph

>> etc fallout. They must have some confidence in that, otherwise they

>> wouldn't have all those white walls and ceilings throughout the station!

>>

>>

>> I was there, there ARE near horizontal covers over the running lines, the

>> design will be difficult to clean. It won't get dirt from the trains, but

>> people are pretty dirty too. Probably more so than the mechanical

>> interactions of the train with their infrastructure. See attached photo I

>> took this morning at the 'Community Day'.

>>

>> The brown part is over the tracks (I think there are air conditioning

>> ducts between the running tunnel and the top of this structure) and it will

>> be a trap for dust and debris. There are slats running length-ways with

>> what looks like black painted board under the lengthwise slats. Any loose

>> paper or lolly wrappers that end up there will stay up there. There are

>> also places where people could toss stuff onto them from the concourse. But

>> with the height above the platform below, any one going to clean them is

>> going to have to have fall restraint - but there is no obvious attachment

>> points for their harness. So I guess it won't get cleaned until it gets

>> disgusting and they bring a EWP down the lifts one close down weekend and

>> clean it.

>>

>> The station design is a dirt trap. Otherwise appears to be well designed

>> station to move people in and out. Lots of escalators and lifts. Wide

>> passages.

>>

>> But they seem to have missed easy to clean and easy to maintain.

>>

>> The areas you can't see are probably larger than the public spaces, the

>> station also contains at 11kv substation, LV switch rooms and a traction

>> supply substation - and a significant amount of 'air handling' equipment.

>>

>>

>> There are also not enough seats, but since the maximum you would be

>> waiting is 10 minutes I'll give em that one.

>>

>> The former ECRL stations have open topped running lines - at North Ryde

>> where my sister lives, you can look down onto the roofs of the passing

>> trains. (And if so inclined throw things at them.)

>>

>>

>>

>>

>>

>>