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Author Topic: Great Western Main Line electrification - ongoing discussion  (Read 48435 times)
Western Pathfinder
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« Reply #525 on: November 18, 2018, 04:02:47 pm »

Just found this on YouTube may be of interest?.
https://m.youtube.com/watch?v=5nLwKRtfOKs&feature=youtu.be
Thanks for posting that. Interesting.  In my days on the WCML in the Late 1960/Early 1970s, the MK1 OLE wasn't that slack and I certainly don't remember that much uplift.  I speak from a position of authority on that as I used to be hanging in a signal cage between tracks and having pantographs passing me at about 2.5m away at 100mph Grin


My pleasure S&T thought you might find it interesting.
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paul7755
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« Reply #526 on: November 18, 2018, 04:24:03 pm »

I speak from a position of authority on that as I used to be hanging in a signal cage between tracks and having pantographs passing me at about 2.5m away at 100mph

I do not think that H&S would allow that today.
I think they do.  Iím fairly sure they are still being installed, are there not a few in the Reading station area?

Paul
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« Reply #527 on: November 18, 2018, 04:53:41 pm »

Just found this on YouTube may be of interest?.
https://m.youtube.com/watch?v=5nLwKRtfOKs&feature=youtu.be
Thanks for posting that. Interesting.  In my days on the WCML in the Late 1960/Early 1970s, the MK1 OLE wasn't that slack and I certainly don't remember that much uplift.  I speak from a position of authority on that as I used to be hanging in a signal cage between tracks and having pantographs passing me at about 2.5m away at 100mph Grin


The Mk 1 may have been fixed tension in those days, very little give which surprisingly enough meant lower line speed.   The up lift of series 1 & 2 I doubt is more than Mk 3.


I speak from a position of authority on that as I used to be hanging in a signal cage between tracks and having pantographs passing me at about 2.5m away at 100mph

I do not think that H&S would allow that today.
I think they do.  I’m fairly sure they are still being installed, are there not a few in the Reading station area?

Paul

Cages for signal maintenance are an option of last resort now, especially with LED signal heads, preferred methods are either from a MEWP (Mobile Elevated Working Platform) aka a cherry picker or on winch / tilt over mast.
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stuving
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« Reply #528 on: November 18, 2018, 04:56:31 pm »

Just found this on YouTube may be of interest?.
https://m.youtube.com/watch?v=5nLwKRtfOKs&feature=youtu.be
Thanks for posting that. Interesting.  In my days on the WCML in the Late 1960/Early 1970s, the MK1 OLE wasn't that slack and I certainly don't remember that much uplift.  I speak from a position of authority on that as I used to be hanging in a signal cage between tracks and having pantographs passing me at about 2.5m away at 100mph Grin

For Series 1, the design pantograph uplift is 80 mm, with a maximum of 200 mm allowed for before bits hit each other. The allowed circumflex in a single-span overlap (which AIUI is the static rise in the two contact wire heights where they are equal) is 10-70 mm. The picture doesn't look much different from those figures allowing for the foreshortening that exaggerates the bounce and floppiness of all the wires.
« Last Edit: November 18, 2018, 06:38:30 pm by stuving » Logged
SandTEngineer
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« Reply #529 on: November 18, 2018, 05:37:53 pm »

Thanks for that STUVING.  Maybe its just that the video was taken with a slightly phototelescopic lens?  By the way, did you mean 200mm and not 200m?
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stuving
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« Reply #530 on: November 18, 2018, 06:37:55 pm »

Thanks for that STUVING.  Maybe its just that the video was taken with a slightly phototelescopic lens?  By the way, did you mean 200mm and not 200m?

Yes, of course, thanks. You know the perspective is misleading because the supports and registration arms look so close to each other, on plain line where you know they aren't. It's even quite hard to see which bits are attached to which portal.

There are lots of Knightons, this must be the one between Uffington and Shrivenham - though the crossing was closed several years ago, and was named for nothing more than a copse.
« Last Edit: November 18, 2018, 06:56:06 pm by stuving » Logged
DidcotPunter
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« Reply #531 on: November 18, 2018, 08:00:20 pm »

Hmm. It was clearly taken with a telephoto lens though the uplift from the pantograph looked pretty normal to me.

Knighton is a bit more than a copse, it's a hamlet/village about a mile south of the site of the crossing.

https://www.google.com/maps/@51.5834848,-1.5930662,3a,75y,180h,90t/data=!3m6!1e1!3m4!1sh4p0dvfEfXIXEJv-p1TSYA!2e0!7i13312!8i6656

Here's the site of Knighton Crossing (before electrification), it's on the road between Knighton village and Longcot.

https://www.google.com/maps/@51.5992317,-1.6024652,3a,75y,319.26h,86.35t/data=!3m6!1e1!3m4!1sYYEmXfoIekHu-ZQ1G8oxGg!2e0!7i13312!8i6656

It was replaced by this underbridge on Claypit Lane between Uffington and Longcot which the Knighton road was diverted into.Might have been at the time HSTs were introduced in 1976 or even earlier?

https://www.google.com/maps/@51.5997639,-1.6008706,3a,75y,342.34h,101.29t/data=!3m6!1e1!3m4!1symZBAt4wGsQSgTExObcU8A!2e0!7i13312!8i6656

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stuving
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« Reply #532 on: November 18, 2018, 08:15:28 pm »

Knighton is a bit more than a copse, it's a hamlet/village about a mile south of the site of the crossing.

Fair enough - I apologise to all Knightonians about that. Mapmakers have decided that Compton Beauchamp is a more important place, for some reason.
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ellendune
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« Reply #533 on: November 18, 2018, 10:58:23 pm »

I can confirm that Knighton is a hamlet within the parish of Compton Beauchamp and although not large is a quite a high proportion of the parish as a whole.

I can also confirm that Knighton crossing was closed as part of the HST works in the 1970's. In fact Claypit lane was diverted with a new bridge constructed under the railway. The current connecting road from the road from Knighton was actually the original connection to allow Claypits lane to cross the railway at Knighton Crossing.   
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Oxonhutch
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« Reply #534 on: November 19, 2018, 05:52:05 am »

Adrian Vaughan "Signalman's Reflections" has a section on working Knighton Crossing as a school boy in the 1950s, and the role it played in regulation traffic to and from Chippenham. He also relates how the signalman of the day got its status, and hence his pay, raised by having the locals (Knightonians perhaps) use the crossing a lot more on assessment day.
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