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Great Western Electrification Progress

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RP

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On recent trips between Ebbw Valley and Cardiff I have noticed more masts erected each time in recent weeks. Two or three bridges are being worked on and the last big one in Cardiff (Splott Road) is now underway. Piling mostly throughout but with still some gaps.

Observations from a trip from Newport to Reading on 20.2.17 to add to others' information:

Newport station - quite a lot of canopy altered apart from adjacent to old footbridge which is still in place - this on platforms 1,2 and 3. Masts erected between Llanwern West and Bishton crossing with some gaps. Piles alongside relief lines as well as mains including approaches to flyover as far as I could see. Most bridges complete or nearing completion except for the one adjacent to Severn Tunnel Junction station.

More masts around Pilning and more piles approaching Patchway Tunnels, where they are set between the two tracks on the multi-level section; similarly on the Patchway station side. Not much yet around curve to Bristol Parkway (the depot is rather distracting with all its wiring!). On a trip to Bristol two weeks ago, some piles between Patchway and Filton Junction on the other side of the triangle(which I wasn't expecting yet).

Not much evidence between Bristol Parkway and Badminton but piles and masts start soon after the latter, though again with some big gaps sporadically to Swindon, where there had been recent piling approaching the junction with the Kemble line. Still some bridge works on this stretch (e.g. Wootton Bassett)

After that, there were masts and gaps on the stretch which parallels the A420 near Shrivenham and I noticed much more progress on the four track section near Challow since my last trip a few weeks ago, with some registration arms and some wiring as well. A gap, then, as others have mentioned, at Steventon, before completed wiring at Didcot. And of course, the progress others have referred to at Reading.

Hope this is of assistance.
 
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Unclepete

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Hi, couple of shots from Newbury Racecourse last week.
The building on the right in the first shot is the old sterling cables, which is coming down soon. The electrical sub station is being build right next to it, so won't start until this happens.
 

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4973

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I notice that there is a blockade on the main lines between Cardiff and Newport this coming Sunday (26th).

Anyone know precisely what will be done?

What I can see on RTT suggests it is not between Newport station and Ebbw Jct but could be anywhere between Ebbw Jct and the Cardiff station since Cardiff Platform 2 is in use but Platform 1 is not.
 

3973EXL

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Sonning cutting, most return conductor up on both sides.

Mast in the DM cess now up with cantilever fixed.

Other than small steel work, registration arms on 7 x cantilevers on the mains left to do.
 

Peter Mugridge

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The building on the right in the first shot is the old sterling cables, which is coming down soon.

Thanks... I'm doing a painting set in Newbury at a date in the not too distant future; I am guessing I am now going to have to paint over this local landmark tower in the background...?
 

hwl

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Given progress on the Maidenhead - Reading reported here lately presumable we are looking at the wiring being ready for energisation and test running a along time before December so potentially some good news for NR (and GWR)?
 

3973EXL

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First contact wire up over the DM in central area of Sonning cutting.
 

LNW-GW Joint

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I couldn't see any missing masts today between Airport Jn and Tilehurst.
A few booms missing between Maidenhead and Reading, but the steelwork seems mostly complete.
The OHL looks least complete Ruscombe-Twyford West, with not much reg gear.
A few masts on the Didcot avoiding line, running out before Appleford.
 
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fgwrich

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Couple of shots taken in the Reading area on the weekend.
 

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Wilts Wanderer

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The first few headspans have been erected between Chippenham and Wootton Bassett Jcn over the weekend, and some (but not all) of the missing masts appear to have gone up as well, plus some brackets for the fittings.
 

SpacePhoenix

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Where the SWT's Reading-Waterloo route runs from Reading up to where it diverges, has the OLE installed have provision for future conversion (if it ever happened) without replacing loads of stuff?
 

swt_passenger

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Where the SWT's Reading-Waterloo route runs from Reading up to where it diverges, has the OLE installed have provision for future conversion (if it ever happened) without replacing loads of stuff?

The lines into P4,5,6 are independent of the GWML and don't have any OHLE installed. There's no overlap between the two systems, the spur lines and the underpass are not electrified.
 

smiffy9373

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Platform 8 is definitely wired. Drove through there yesterday and today.

Sent from my SM-T535 using Tapatalk
 

fgwrich

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They must have worked on that fairly quickly then, I only took those shots on Saturday evening. It's also interesting to see some of the work is spreading around the chords to Reading West, even with the bulk of the attention on the mainlines.
 

hwl

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I thought they were avoiding headspans.

So did I.
Did the poster really mean headspans rather than booms?
Possibly a temporary overrun solution if an electric train is routed the wrong way?
Don't the wires need to reach Chippenham for 1 of the feeder connections anyway?
 

D1009

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So did I.
Did the poster really mean headspans rather than booms?
Possibly a temporary overrun solution if an electric train is routed the wrong way?
Don't the wires need to reach Chippenham for 1 of the feeder connections anyway?
Yes, Thingley Jn is to be the limit of electrification for the time being.
 

3973EXL

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I couldn't see any missing masts today between Airport Jn and Tilehurst.
A few booms missing between Maidenhead and Reading, but the steelwork seems mostly complete.
The OHL looks least complete Ruscombe-Twyford West, with not much reg gear.
A few masts on the Didcot avoiding line, running out before Appleford.

I had a look around today, and as you say, only found three portals missing. Two east of Twyford station, one at the west end just off the platform.

Registration arms incomplete - Ruscombe to Twyford West
Mains west end of Sonning cutting
Kennet loop/bridge area
Plat 15
There is current overnight work and the numbers seem to be decreasing. Equipment in the Up cess in the Kennet loop area waiting to go up.

West of Reading to Scours Lane/Oxford Rd looks like it just need wires.

The overhead pipe at the west end of Sonning cutting appears to have been raised.

The wires from Airport Jn end west of Maidenhead by MP25. There is then a gap of nearly a mile before they recommence. The DM is most advanced being up as far as Shottesbrooke, but with a gap. The UM is not so advanced and there is less on the DR/UR.

Difficult to judge the state of progress on the Newbury line as a lot of the piles have been in for some time and there seem to be quite a few double track cantilever masts being used.

As a guide I counted, on the down side, 140 masts from Southcote to Thatcham, and 47 from there to Newbury.
 

ANP1990

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First masts are up between newbury station and the racecourse. Most of the masts also had the cantilever spans attached.

Further, the bridge carrying the A339 across the line at Newbury, has had the top of the parapet removed.
 

Wilts Wanderer

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So did I.
Did the poster really mean headspans rather than booms?
Possibly a temporary overrun solution if an electric train is routed the wrong way?
Don't the wires need to reach Chippenham for 1 of the feeder connections anyway?

The structures are steel transverse gantries (booms?), sorry if I used the incorrect term. Pictures would be difficult from a moving train.
 
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swt_passenger

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The structures are steel transverse gantries (booms?), sorry if I used the incorrect term. Pictures would be difficult from a moving train.

Gantries is ok, or often people use 'portals'; they are the typical names for a goalpost like arrangement. The other options generally used on the route are known as single or twin track cantilevers.

Headspans are no longer considered adequate, especially on four track railways, as the assembly of wires and insulators is under tension across the track between the two uprights, so under fault conditions it quickly goes out of alignment. The Crossrail works on the previously wired section between Paddington and Heathrow are changing some headspans for portals to improve resilience.
 

59CosG95

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So, to clear the "headspan vs twin track cantilever" argument up, here's the two side by side. The GWEP equipment, the TTCs, are on the left, and the headspan (probably somewhere on the ECML) is on the right.
 

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snowball

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I found the "Alan Baxter" guide a handy document to understanding OHLE and it's components, though apparently as discussed earlier in thread there are some errors in it.

http://www.bathnes.gov.uk/sites/default/files/sitedocuments/Planning-and-Building-Control/Planning/nr_a_guide_to_overhead_electrification.pdf

There's also this book, also downloadable, released last autumn by a contributor to these forums:

http://www.railwaysarchive.co.uk/OLE/

and this thread which he set up to discuss it:

http://www.railforums.co.uk/showthread.php?t=138230
 

3973EXL

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Another contact wire run has gone up in Sonning cutting, UM adjacent to the one on the DM. Runs from east of Duffield road bridge to west of Butts Hill road bridge.

Unable to go further west yet as there are two cantilevers with missing registration arms. These are now the last two in the cutting still to do.
 
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