Philip Phlopp
Established Member
- Joined
- 31 May 2015
- Messages
- 3,004
Cable route I believe.
And access for permanent way teams, allowing them to avoid the restricted clearance new tunnel, IIRC.
Cable route I believe.
And access for permanent way teams, allowing them to avoid the restricted clearance new tunnel, IIRC.
Anyone know what the Network Rail train with a DRS 37 on doing at Blackpool North, it's been in Platform 1 since yesterday afternoon and was still there at 8am?
Looking at pictures 5378m and 5378k taken on 16th November, I don't see any evidence of the tunnel invert being concreted. This task must be running later than expected.Further to recent debate about what the tracks will stand on in the new tunnel, Wrinkley, Paul and I attended a superb Network Rail presentation this morning where the engineer said it will be concrete slab with ballast on top.
Work is in progress pouring the concrete.
Can you remember which bridge it was? There are probably pictures of it in LDECR's album.My very first job as a junior draughtsman was designing handrails for a bridge between Bolton and Lostock Jcn. I suppose they have now gone with all the rebuilding.
Also Joseph Locke has suggested bats may be encouraged to roost there.Does anyone know what the plan is (if there is one at all) for the tunnel currently in use?
Can you remember which bridge it was? There are probably pictures of it in LDECR's album.
Can't remember the bridge number or name but I do know it was one of several very similar over bridges approaching Lostock Jcn from Bolton. It had a set of stone steps on what is best described as the south west corner leading down to a public footpath below. The handrail was formed from tubes set in concrete cappings to the edge of the steps.
I'll have a look through the albums. Thanks.
Do any of 3544r, 3548e, 4086v or 4472k ring any bells?
Your text description fits both Ladybridge and Dean Clough bridge
Steady on! I don't recognise those numbers, remember I am talking 1964!
I had a look at Google maps and you are correct it was one of those two. I remember passing years ago on a train and noting the similarity but only one had my handrails.
I can see I am going to have to have a train ride to satisfy my curiosity!
Thanks.
Those numbers are the numbers of photographs in LDECR's album.
Do any of 3544r, 3548e, 4086v or 4472k ring any bells?
Your text description fits both Ladybridge and Dean Clough bridge
Anyone know what the Network Rail train with a DRS 37 on doing at Blackpool North, it's been in Platform 1 since yesterday afternoon and was still there at 8am?
I wonder if they will survive the finished job? They have managed 52 years so far!
It would be a delightful coup to do a 'then and now' of you and the railings with an electric in the background. Interested?
Well, it will be 2018 if there's a contractor in place to takeover from Balfour Beatty!
Agreed - though highly likely Carrillion not sure the paper work is signed off on yet.
Bolton News item on Farnworth tunnel:
http://www.theboltonnews.co.uk/news...in_a_lifetime_job_quot__at_Farnworth_Tunnels/
Several pictures of the tunnel but still none showing any filling in of the bottom. What's keeping them?
When were the photos taken. Newspapers have a habit of using stories when they have a gap to fill.
They appear to be ballasting the invert rather than concreting it, but I'd say they're about 50% done doing it.
They appear to be ballasting the invert rather than concreting it, but I'd say they're about 50% done doing it.
Many thanks to you and Tom.
As you remark in one of the captions, the material used to fill the base of the tunnel is finer than normal ballast. It probably falls in one of these categories:
https://www.google.co.uk/url?sa=t&r...sg=AFQjCNF7Fmsh5PUxZxoKBNE4GY89-rLBig&cad=rja
(This is from a US source which came near the top of my Google search. Maybe Britain has slightly different definitions.)
No doubt there will be a layer of ordinary ballast on top.
Looking at the shots which show the ballast in the tunnel and its ends I'd say the tunnel material we can see is normal size, but a rather redder colour than what I'm used to
Many thanks to you and Tom.
As you remark in one of the captions, the material used to fill the base of the tunnel is finer than normal ballast. It probably falls in one of these categories:
(This is from a US source which came near the top of my Google search. Maybe Britain has slightly different definitions.)
No doubt there will be a layer of ordinary ballast on top.
Natural aggregates
The Department of Transport 'Specification of Highway Works' (SHW) defines a number of well graded aggregates based on the composition of particle sizes contained in the commercially produced mixture. Clause 803 defines Department of Transport (DTp) Type 1 granular sub base and Clause 804 describes DTp Type 2 granular sub base. These aggregates are more commonly referred to as 'Type 1' and 'Type 2'.
Type 1
This is the most common well graded granular sub base material used to construct a path's base layer. It is a well tried and tested component of lowland paths that has been used for many years as the default base layer material. Commercial quarries supply DTp Type 1 granular sub base consisting of crushed rock graded to a specification that has a defined proportion of stone particle sizes. Well graded Type 1 contains a good mix of angular aggregate sized between 63mm and 'fines' (sand sized particles), however, most of the aggregate content is less than 32mm in size - the European Norm standard for Type 1 is 0/32. The solid stone particles should not exceed 63mm in size and less than 9% of fines. This ensures the material has an acceptable level of natural interlock between the angular aggregate particles and no voids once compacted. Type 1 is subject to regional variations based on geology - most quarries in central, west and south Scotland produce it from grey whinstone, a few quarries in eastern Scotland produce it from reddish whinstone, and further north it is produced from granite.
Type 2
Like Type 1, this is crushed rock less than 32mm in size with less than 9% 'fines' but with no specified grading. It usually contains finer material than Type 1, being composed of fewer angular aggregate sizes. Type 2 is not as strong as Type 1, so for that reason, it is not generally used on its own to build a base layer. It would usually be used to form the lower part of a base layer with Type 1 laid on top.