Aictos
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Can you please supply a source for this fact?
Otherwise it’s just your own opinion which has no standing.
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Great Western Electrification Progress
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Can you please supply a source for this fact?
Otherwise it’s just your own opinion which has no standing.
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RailUK Forums
Where has that march month come from. what are they actually doing with the tunnel ??collecting data, polishing up the conductors...?? offering prayers??
Again, any more definitive words from Mr Dolphyn??
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Tom Quinne
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People actually working on the project, and official information issued to those who need to know.
It’s not as simple as leave the tunnel isolated and forget about it, along hangs on being able to run full fat EMUs through to Wales.
It’s not as simple as leave the tunnel isolated and forget about it, along hangs on being able to run full fat EMUs through to Wales.
Mr Dolphin has said March on Twitter it least once. March is what we’re being told at GW what is being worked towards. I don’t know the specifics of work/sign off required.
what is the source of the estimate please. Are F& F signed on to this???
Furrer and Frey have issued a10 point statement referring to British contracts (reading between the lines it obviously refers to the Severn Tunnel) setting out remedial work/forward planning that may be needed to ensure reliability.A previous message by F& by a member mentioned drip trays.I notice that these are mentioned specifically as a possible solution to reduce corrosion byF&F.
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ATW158Xpress
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Yes test train will be making 24 trips between Cardiff Brickyard Sidings and Gaer Jn to test the OLE from St Bride’s (Newport) neutral section to the limit of wires at Cardiff West Jn/Line A and Brickyard Sidings.
https://www.realtimetrains.co.uk/se...0?stp=WVS&show=non-passenger&order=wtt&toc=GW
Elecman
Established Member
That is not a FACT unless you can provide an author active source until you do it is merely your misguided opinion
From F&F “NetworkRail has chosen to temporarily suspend acceptance of future installations of R.O.C.S until further remedial action is completed in a small number of specific wet locations”F&F Network Rail are “cooperating closely”.F&F also seem to imply that it is Network Rails responsibilty to improve the wet area problems
Scottychoo
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Well let's see who is correct then, I will put money on it not being you. You heard it here first.
oglord
Member
What is the point in posting things like this?
Some don’t like being pointed out that they’re wrong. So instead of admitting they’re throwing the proverbial at the wall in the hope it will stick; they double down inferring that they somehow have insider information that’s different from all the other insider information that’s being regurgitated on the forum - hence the “heard it here first” comment.
Meanwhile in reality my employer is briefing me for March, we’ve seen comments on Twitter from senior project engineers that it’s March. My friends and colleagues directly involved in the project say it’s March... But I guess my circle of friends and colleagues is missing that one big piece of the jigsaw that makes young Martin here so sure that we’re all wrong and he’s right.
Fingers crossed! Hopefully while I'm waiting I'll see an IET coming in from London pan up!
Aluminium contact wire?! I'd not heard this. Isn't it a tad on the soft and ductile side for this purpose, along with being very galvanic? I take it this is an alloy (Aluminium Silver or Aluminium Titanium or such)?
The key word tends to get forgotten!
Aluminium Alloy contact wire to match (chemically for anti-corrosion purposes) the extruded rail system that supports the contact wire in the tunnels so presumably AA6082-T6 (convienienty available off the shelf from specialist electrical cable manufacturers).
Soft or ductile doesn't apply to 6082.
The contact wire is closely supported by an inverted U-cross-section "rail" made from section of Aluminium alloy extrusion that reduces clearances as there is effectively zero movement
https://www.furrerfrey.ch/en/systems/conductor_rail.html
Also recently installed in the Crossrail and Glasgow Queen Street tunnels.
I think many of us suspect that the delay in turning it on has contributed to the corrosion issues as they should reduce when the juice is on.
DidcotDickie
Member
The ORR has now authorised the electrification from Bristol Parkway to Cardiff - including the Severn Tunnel which is subject to a derogation for the use of aluminium contact wire.
https://twitter.com/railandroad/status/1213087341549686789
https://t.co/lwPJUYXU7D?amp=1
https://twitter.com/railandroad/status/1213087341549686789
https://t.co/lwPJUYXU7D?amp=1
GRALISTAIR
Established Member
Now that is good and major news. Excellent
Pardon my ignorance, but does this 'beat' the March target that was stated for the tunnel to go live? I note that it is subject to a speed restriction of 75mph through the tunnel "until additional testing in accordance with ENE TSI clause 6.2.4.5 is carried out" - presumably that is what is scheduled to be completed by March, but it is theoretically completely usable now?
GRALISTAIR
Established Member
Linda smith
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Word on the street is that the orr signed off the Cardiff - bristol section for traffic. This includes the Severn tunnel btw.
swt_passenger
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Or the actual ORR letter is linked in post #9562?
Thanks again hwl. I take it the substitution of aluminium alloy contact wire for the copper (alloy) one was to limit galvanic corrosion from the aluminium rail to the copper wire? As regards the use of aluminium in catenary (as opposed to contact) wires weren't there issues with the MK IIIa/b acsr? although I think this related primarily to wear and tear I seem to recall some electrical issues too. One does wonder, if cost were no issue, what would be the best material for the various ole wires for difficult, corrosive environments; Gold + Titanium/Tungsten maybe?
yes but other different corrosion issues on other components elsewhere too.
No simple answer as very few good conductors to chose from and very different chemical issues in different locations.
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