Cogload Junction Engineering

Discussion in 'Infrastructure & Stations' started by ikcdab, 27 Oct 2019.

  1. ikcdab

    ikcdab Member

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    A replacement switch is being installed at Cogload Junction. Looking from the lineside, it looks as if its the up line facing points for the Westbury line. Much infrastructure and new trackwork has been assembled lineside but it looks as if it will need considerable lifting to move it into position. GWR Engineering website shows line closure from 9 Nov to 14 Nov so I assume thats when the work will take place. There is very good public viewing from the adjacent canal towpath.
    Does anyone have any other details. i imagine a large crane will be needed and I would like to see it in action.
     
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  3. civ-eng-jim

    civ-eng-jim Member

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    It's a 90mph turnout so it'll be an "H" switch which is a 130m-long set of points.

    Are they replacing both the switches and crossing? Or just the switch blades? Looks like it's all on timber at the moment, so probably the whole thing is being replacesd. The track will be broken into panels and laid in complete bits but the switch panel on one of those is 45m long. Not sure how that got to site. Would be interesting to see.
     
  4. ikcdab

    ikcdab Member

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    It's looks as if the whole turnout is being replaced as there is a new one on concrete sleepers being assembled lineside as well as a lot of plain line. At the moment it looks as if someone has laid all the hornby setrack out ready to slot it in. As I said, it's going to need a big crane too lift it all in.
     
  5. ikcdab

    ikcdab Member

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    More infrastructure has arrived. There are a long line of trollies now stashed by the line and what look like track jacks. These must all have arrived by train as the road access is appalling. Lots of new track also laid out. I live by the line and didnt hear it. Attached photos taken from public land. Work starts next weekend.
    All comments welcome. rsz_20191103_112115.jpg rsz_120191103_120636.jpg
     
  6. civ-eng-jim

    civ-eng-jim Member

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    Ah, they're using PEM LEM to bring in the junction. Some good videos on how they operate.
     
  7. Llanigraham

    Llanigraham On Moderation

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    PEM LEM?
     
  8. davetheguard

    davetheguard Member

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    One direct train every two hours will continue to run between Paddington to Plymouth via Yeovil Pen Mill & Junction during the closure of the line via Cogload Junction. Otherwise it's road coaches between Castle Cary & Tiverton Parkway, and in addition, some direct coaches from Bristol Parkway/Bristol Temple Meads to Tiverton Parkway.
     
  9. Snow1964

    Snow1964 Member

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    Looks like a right handed turnout in the photo, difficult to see on the picture (not easy to scale the length, so potentially could be more than 90mph for new installation). Suggests it is part of the facing crossover.

    Where all the track plant is sitting, it would be possible to install a flat (no cant) Junction, by effectively extending the avoiding line to where the plant is sitting rather than having it where Line turns the corner. Much easier to have turnouts on straight section.

    Not sure how much time a line speed turnout would save over a 90mph one though. Don’t really need a 5 day closure to crane in a like for like replacement that is preassembled in big sections even allowing time to relay the ballast bed, which suggests other work.
     
  10. Rob F

    Rob F Member

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    Would there be any benefit in re-instating the four tracks from the junction to Taunton?
     
  11. ikcdab

    ikcdab Member

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    I live right by the line at Cogload so follow the trains closely. I would say that with the speed and acceleration of modern trains, I see no advantage in reinstating the quadruple track. It is a rare situation where I see one train closely following another and then I hear them accelerate quickly. I suggest there are better things to spend the money on.
     
  12. ikcdab

    ikcdab Member

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    There is also lots of plain track pre-assembled so it's more than the turnout. It's not really a crossover, it's the right hand point which branches of the Westbury line to pass under the Bristol flyover.
     
  13. Ploughman

    Ploughman Established Member

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    PEM's and LEM's are those yellow bits of equipment.
    The tall frames lift up the track panels then the lower cart type bits run underneath the panels on temporary track.
    The frames lower onto the carts and move the panel along the track to its intended location.

     
  14. eman_resu

    eman_resu Member

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    Anybo
    Now thats a very clever bit of kit.....
     
  15. Ploughman

    Ploughman Established Member

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    What isn't really shown in any detail is the sideways movement of the whole track panel in one piece.
    Regular activity is to build up the panel at track side and walk it sideways onto the railway using the PEMS then lower it onto the LEMS and move to site.
    Older versions were PUMS and PALS not radio controlled so a lot of operators needed.
     
  16. swt_passenger

    swt_passenger Veteran Member

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    Yes, that’s a significant part of their use isn’t it. Because they can move sideways they can also deliver a track panel by running on an existing parallel track, rather than running off the end onto a temporary rail setup.
     
  17. Meerkat

    Meerkat Established Member

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    How does it walk them sideways? Seemed odd that the video missed that bit out
     
  18. swt_passenger

    swt_passenger Veteran Member

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    Basically one set of legs extends all the way out to one side, then with the load lifted the “bodies” shorten the extended legs while simultaneously extending the other side set of legs. Then they lower the load, lift all the legs and then repeat.

    I think there’s a different video that shows it better than I can explain, there’s a sideways move shown about a minute into this one:
     
    Last edited: 7 Nov 2019
  19. Joseph_Locke

    Joseph_Locke Established Member

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    They're French kit, so PEM will be Portique something du Manutention and LEM Lorrey something du Manutention
     
  20. Meerkat

    Meerkat Established Member

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    Thanks. That’s the impressive bit, surprised it wasn’t in the earlier video!
    Must have to be pretty careful what you are putting the panels down on on the way, or are the panels strong enough to cope with twisting or edges?
     
  21. pdeaves

    pdeaves Established Member

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    The trolleys moving down the ramp at circa 4 minutes remind me of something from Thunderbirds, for some reason.
     
  22. MarkRedon

    MarkRedon Member

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    PEM = Portique extensible de manutention = extensible gantry handling for maintenance, LEM = Lorry élévateur motorisé = lorry powered lift. See https://www.geismar.com/produits/systeme-de-pose-d-appareils-et-de-panneaux-de-voie-pem-lem/ for the original in French and https://www.geismar.com/products/turnouts-and-track-laying-system-pem-lem/?lang=en for the equivalent in English. The supplier Geismar here claims to be the world leader for replacing turnouts. "You can use the machines for any turnout length & type merely by adjusting the number of PEM-LEM sets."

    I'm amused by the onward march of franglais, the tendency for new vocabulary in French to lift directly from English! Bon week-end à vous toutes et tous = a good weekend everybody...
     
  23. Ploughman

    Ploughman Established Member

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    With the older kit PUMS one of our supervisors rememberd what they where by using PUMS = Picking Up Machines.
    Cannot remember if he had anything for PALS though.
     
  24. Joseph_Locke

    Joseph_Locke Established Member

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    Pretty Awful Lifting?
     
  25. Ploughman

    Ploughman Established Member

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    ESholt Springs jcn 1993 May PALs and PUMs
     

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  26. Joseph_Locke

    Joseph_Locke Established Member

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    No PAL in those pictures! PAL was the one that came in bits, with a separate power pack.
     
  27. Hellzapoppin

    Hellzapoppin Member

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    The PEMs and LEMs will lift and move the plain track panels but a KIROW will move the switch I believe.
     
  28. ikcdab

    ikcdab Member

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    The kirow has been lifting and moving the plain track. The PEMs etc don't seem to have moved yet...
    20191112_225744.jpg 20191112_225928.jpg
     
  29. Meerkat

    Meerkat Established Member

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    The 66 looks like it has a baby brother piggyback!
     
  30. takno

    takno Established Member

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  31. Mordac

    Mordac Established Member

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    To quote Father Ted, it's far away rather than small. ;)
     

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