Four track for Filton Bank - ongoing discussion

[whole diary]

[SandTEngineer]

Grahame, dont forget that in an ealier post I mentioned passive provision for ASHLEY HILL station with platforms on all four lines.  I think in the case of STAPLETON ROAD and LAWRENCE HILL we are looking at GRIP^▸ (Guide to Railway Investment Projects) 3 optioneering out new platforms on the MAIN lines for those stations on cost grounds......

[Bmblbzzz]

I was slightly surprised to see what I saw. Sometimes you see a waggon loaded with track sections, and it's a length of rails with sleepers attached. I always thought that's how track was laid – sections of ready-assembled rail and sleepers put in position then welded together. But no, it seems that in some cases at least, the sleepers are laid down (with extras and/or mistakes!) then, presumably the rails attached.

[Bmblbzzz]

Musical chains:
https://youtu.be/pIgZ7gMze7A

https://youtu.be/GZw_8PBdSfA

[Red Squirrel]

As I have said quite a few times on this forum now the WR doesn't do FAST^▸ (Federation Against Software Theft), SLOW or LOCAL lines...

Being a pedant myself, I can only apologise for falling foul of this shibboleth. Just to be completely clear, though, does 'WR' refer to the Western Region of British Railways? Because that ceased to exist in 1992...

As to the question of how the track will be laid, maybe something like this will be used? https://www.youtube.com/watch?v=qLwO6u1J-w0

[rower40]

As to the question of how the track will be laid, maybe something like this will be used? https://www.youtube.com/watch?v=qLwO6u1J-w0

I'm hoping for something like this:
https://m.youtube.com/watch?v=jrmZIgVoQw4
(1m30 in)

[JayMac]

I totally understand that "main" and "relief" are a tradition that goes back to Marc Brunel. 

Did he employ these terms when designing block pulley making machinery, or when designing the Thames Tunnel? 

[JayMac]

Being a pedant myself, I can only apologise for falling foul of this shibboleth. Just to be completely clear, though, does 'WR' refer to the Western Region of British Railways? Because that ceased to exist in 1992...

It should of course be NR^» (Network Rail - home page)(W) these days. 

[Bmblbzzz]

As to the question of how the track will be laid, maybe something like this will be used? https://www.youtube.com/watch?v=qLwO6u1J-w0

I'm hoping for something like this:
https://m.youtube.com/watch?v=jrmZIgVoQw4
(1m30 in)

Or maybe it will be like the scene with the train crossing the canyon in Back to the Future 3, there'll just be a flash of light and we'll wake up in the future?

[paul7575]

I was slightly surprised to see what I saw. Sometimes you see a waggon loaded with track sections, and it's a length of rails with sleepers attached. I always thought that's how track was laid – sections of ready-assembled rail and sleepers put in position then welded together. But no, it seems that in some cases at least, the sleepers are laid down (with extras and/or mistakes!) then, presumably the rails attached.

I think a lot depends on what is there already.   Short panels have their uses, particular in areas of dense S&C^▸ (Settle and Carlisle ), but if the final requirement is for continuous welded rail, and there are existing tracks to work from, (like in the case of four tracking an existing two track railway), I expect it is quicker to deliver the LWR strings (216 metres each) using the normal delivery trains, and then work from the existing railway using road rail machines for the nearest track installation on prepared sleepers, and then work from that track when complete to do the second (further) new track.

Added a video, showing how an RRV^▸ (Road Rail Vehicle) can transfer a dropped LWR onto positioned sleepers, starts about 2 mins in:  https://youtu.be/SupWOAddodw


I think the 'new track machine' in the video being used on the Borders, and the similar Balfour Beatty blue coloured machine are more useful when installing a single track for the first time where they are either working from one end to another, or they are installing the first track on a completely new formation, such as when the Bermondsey dive under work was in progress.

Paul

[tramway]

So which were 'MAIN' and 'RELIEF' lines through Stapleton Road/Lawrence Hill?

Regarding tackbed height, it looks considerably lower on the reinstated route and far lower than would make the old platforms viable.

Will it be only on the RELIEF (Northern) section that will require dual running signalling?

[SandTEngineer]

So which were 'MAIN' and 'RELIEF' lines through Stapleton Road/Lawrence Hill?

Regarding tackbed height, it looks considerably lower on the reinstated route and far lower than would make the old platforms viable.

Will it be only on the RELIEF (Northern) section that will require dual running signalling?

As posted above. The RELIEF lines pass through the existing STAPLETON ROAD and LAWRENCE HILL station platforms.

Not sure what you mean by dual running?

[TonyK]

So which were 'MAIN' and 'RELIEF' lines through Stapleton Road/Lawrence Hill?

Regarding tackbed height, it looks considerably lower on the reinstated route and far lower than would make the old platforms viable.

Will it be only on the RELIEF (Northern) section that will require dual running signalling?

Except that if you have ever boarded a train at either station, you will realise what a step up to the train it is. I had to give a rather elderly lady a bunk-up at SRD one day, an experience I would prefer not to repeat. I left it to the crew to help her down at Lawrence Hill.

[Western Pathfinder]

So which were 'MAIN' and 'RELIEF' lines through Stapleton Road/Lawrence Hill?

Regarding tackbed height, it looks considerably lower on the reinstated route and far lower than would make the old platforms viable.

Will it be only on the RELIEF (Northern) section that will require dual running signalling?

Except that if you have ever boarded a train at either station, you will realise what a step up to the train it is. I had to give a rather elderly lady a bunk-up at SRD one day, an experience I would prefer not to repeat. I left it to the crew to help her down at Lawrence Hill.

Something like this perhaps!."

http://c8.alamy.com/comp/BNYDH6/benny-hill-the-italian-job-1969-BNYDH6.jpg

[TonyK]

Some photos from Constable Road. Not good quality I'm afraid, FT,N!'s will be much better.

Those are much better than I can do for now!

[Bmblbzzz]

In the track laying videos, I'm surprised at how flexible the rails are. It's like a giant ferrous spaghetti machine! But I suppose that once they're fastened to the sleepers, that provides lateral rigidity, so as long as the rail is stiff in a vertical plane, that's all it needs.