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MML Electrification: progress updates

Nottingham59

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100%. I think there's posts from well-informed members as far back as 2019 saying that Leicester station wasn't a show-stopper.
That's my understanding too. But with the contact wire being so low under the station bridge, I do expect that clearances from the platform to the pantograph will be an issue. (Especially as 810s appear to have conducting rather than insulating pantograph horns.)

Maybe they can get a derogation, but I can see they might have to fence off the southern end of platforms and use only the platform past the stairs, which will still accommodate 240m trains.
 
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Nicholas Lewis

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These were used in the Severn Tunnel, not entirely successfully, so I imagine the MML teams are aware of the benefits and risks.
Severn Tunnel very wet with high mineral content in the water as well exacerbated corrosion between different metals not sure thats relevant at Leicester unless the sewer fails!!
 

takno

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Severn Tunnel very wet with high mineral content in the water as well exacerbated corrosion between different metals not sure thats relevant at Leicester unless the sewer fails!!
Even then it would have to fail quite dramatically upwards
 

GRALISTAIR

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Severn Tunnel very wet with high mineral content in the water as well exacerbated corrosion between different metals not sure thats relevant at Leicester unless the sewer fails!!
They will not allow bimetallic aka galvanic couples on this project. One assumes they have learned from the mistakes. A lot more free flow of air in this location too. So will not have the same issues.
 

edwin_m

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For short distances such as this, a conventional wire supported by frequent glass fibre bars (and with insulated paint and surge arrestors if required) is probably a better solution than conductor bar. The overall height is similar and it avoids the complex transitions needed between conductor bar and conventional OLE.
 

Nicholas Lewis

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For short distances such as this, a conventional wire supported by frequent glass fibre bars (and with insulated paint and surge arrestors if required) is probably a better solution than conductor bar. The overall height is similar and it avoids the complex transitions needed between conductor bar and conventional OLE.
Looking at the installation at St. Pancras Thameslink the bar is pretty chunky as are the supports and wouldn't be surprised that catenary would be better solution to maximise rail to wire height distance.
 

Class 170101

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These were used in the Severn Tunnel, not entirely successfully, so I imagine the MML teams are aware of the benefits and risks.
Would fibre glass have been better as supports for the Severn Tunnel conductor bar rather than Aluminium?
 

Bald Rick

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For the avoidance of doubt, and as has been said many times before, Conductor bar is specifically not an answer for limited clearances, although it can help in some places.

However it is the answer for places you want to be maintnenance free (eg Thameslink core, Crossrail core) or where trying to fix the wires (if they came down) would be very tricky (eg under the river Severn with 35 tonnes of water coming through the tunnel every minute).
 

londonmidland

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I've just been talking to an OLE engineer online, regarding the next steps of the MML electrification. There isn't too much information, however its interesting what they have said:

We are electrifying the rest of it. Design already under way for Wigston to Trent Junction. Further design being procured north of there.

The design through Leicester is complete and has continuous live 25kV wiring
 

Meerkat

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Would that mean that adding extra tracks between Wigston and Syston is being shelved, or that the design will allow for that (or at least not block it by building things on the trace)?
 

59CosG95

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Would that mean that adding extra tracks between Wigston and Syston is being shelved, or that the design will allow for that (or at least not block it by building things on the trace)?
That remains to be seem AFAIK. I'm sure it has catered for remodelling in the Leicester area, but what the remodelling entails, none of us on here are sure.
 

Peter Sarf

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That remains to be seem AFAIK. I'm sure it has catered for remodelling in the Leicester area, but what the remodelling entails, none of us on here are sure.
I find myself thinking of Oxford where the remodelling to precede electrification seems to have not yet happened for a long time !.
 

swt_passenger

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I find myself thinking of Oxford where the remodelling to precede electrification seems to have not yet happened for a long time !.
NR are probably waiting for the forum experts to finish designing the extended EWR cross Oxford service patterns. Until that’s done how would they even know how many platforms to build? o_O :D
 

Edvid

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It looks as though an access road is under construction to Three Arches Bridge.

View attachment 157003

That's a fine picture - under-construction access road, rear-view mirror perspective and fully-modified Braybrooke GSP pylon in one shot!

I had a quick browse on RMweb and came across a picture of Wigston MPATS with the autotransformers in place (to the left of picture), so that's the substation side of K2W pretty much done now. The grey line from near the switchgear masts to beyond the distant signal gantry could be a short extension lead.
 

GRALISTAIR

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%7B542e1379-f7d8-4ed7-890e-9c180bed8321%7D_May_Overview.jpg
 

Flying Phil

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In view of its imminent demise, I popped out to the Three Arch bridge...
DSC03532.JPG
There is a nice view on the way there with the hedge cut back.
DSC03533.JPG
 

InTheEastMids

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I very much doubt that's national grid, well, Western Power Distribution, a National Grid company.
No, it's all been rebranded and is as much part of National Grid in every way as the transmission business, and more so than ESO that's had all National Grid branding removed as it transitions to NESO.

The interesting comparison is that the wonky 33 kV line carries similar amounts of power to 25 kV OHLE (tens of MW), so this is one of the arguments for battery trains - a charging hub can be powered by this much cheaper network maintained to "relaxed" tolerances across fields, compared to the high-precision rail system.
 

Yindee8191

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I've just been talking to an OLE engineer online, regarding the next steps of the MML electrification. There isn't too much information, however its interesting what they have said:
So if the design through Leicester is done already while only underway north of Syston, does that imply they’ll be doing it in order after all instead of Syston-Trent Jn first?
 

Nottingham59

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Syston to Trent still has the advantage of tying in the Kegworth grid feeder sooner.
Syston to Trent requires the Kegworth grid feeder, whereas Wigston to Syston can be fed from Braybrooke. A progressive approach would be more sensible, in my opinion. If only to reduce start-stop cycles on the 810 engines.
 

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