Differences between platform edge doors (PEDs) on CrossRail and London Underground (Jubilee Line)

[paulravuslante]

Moderator note: Split from https://www.railforums.co.uk/threads/class-345-progress.120221/

It did cross my mind when I heard it...

We even want to be different from the Jubilee line as we have PSDs rather than PEDs

 

[Horizon22]

We even want to be different from the Jubilee line as we have PSDs rather than PEDs

They are floor to ceiling platform doors, which does distinguish them somewhat from the Jubilee line.

 

[PGAT]

They are floor to ceiling platform doors, which does distinguish them somewhat from the Jubilee line.

That's a trivial difference though. From a practical perspective they are the same thing.

 

[AJDesiro]

That's a trivial difference though. From a practical perspective they are the same thing.

They do serve a different purpose though, the ones on the lizzie are there for separating the airflow between stations and the running tunnels, the fact that they help keep people off the track is merely a bonus.

 

[ThameslinkUser]

the ones on the lizzie are there for separating the airflow between stations and the running tunnels, the fact that they help keep people off the track is merely a bonus.

That is the same as the Jubilee PEDs.

 

[AJDesiro]

That is the same as the Jubilee PEDs.

Surely because they don't create a seal, in the event of something like a fire they would be useless?

 

[zwk500]

Surely because they don't create a seal, in the event of something like a fire they would be useless?

They're a very effective baffle of the piston effect though, even if they're not a seal.

 

[Recessio]

Do the full height ones at Crossrail stations also help with keeping stations cool? I imagine the running tunnels get quite hot with bigger trains and the air conditioning output. If the screen doors are full height, does this mean the hot tunnel air only mixes with the station air for a few seconds when the doors are open?

 

[paulravuslante]

Do the full height ones at Crossrail stations also help with keeping stations cool? I imagine the running tunnels get quite hot with bigger trains and the air conditioning output. If the screen doors are full height, does this mean the hot tunnel air only mixes with the station air for a few seconds when the doors are open?

So far it seems they might help. Paddington Elizabeth line station was freezing in winter though so this is a down side. Remains to be seen how it feels down there in the summer.

 

[Tio Terry]

Not something to be discussed on a public forum, but air flow within a station on an underground line is always influenced by what will happen in an emergency situation. Which may well include terrorist activity and fire.

 

[Basil Jet]

Do the full height ones at Crossrail stations also help with keeping stations cool? I imagine the running tunnels get quite hot with bigger trains and the air conditioning output. If the screen doors are full height, does this mean the hot tunnel air only mixes with the station air for a few seconds when the doors are open?

It takes decades for tube tunnels to warm up. When the Channel Tunnel was opened, it had cheap puny cooling fitted deliberately because it would take so many years for the tunnels to need proper cooling that any cooling system fitted would be life-expired before it was needed.