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The author (John Marshall) of the book from which the Wikipedia information is derived was a well known railway historian. It appears there are three volumes on the Lancashire & Yorkshire Railway. I suspect both situations are probably true, with parts being conventionally tunnelled and other...

A vigorous trade of spoil wagons sounds like good news. Assuming they can get back to the originally anticipated of between 5.6 and 7 metres per day, I attach a graph showing possible completion dates. (of tunnel boring)

Given what we have, whether the existing tunnel was built by cut and cover or not, then yes, tunnelling is the only way. The bad natural ground conditions are there anyway and the backfill from the possible historic cut and cover just make things worse. Let's hope the resin injections...

I do wonder if this information is correct. Wikipedia entry for Farnworth Tunnel states:- The reference for this information is:- John Marshall (1969) The Lancashire & Yorkshire Railway, volume 1. ISBN 0 7153-4352-1 I think that any attempt to rebore a cut and cover tunnel is an...

I feel certain I have seen such a document somewhere??? In looking, I found yet another article about the tunnel re-bore Here on Page 30.

I fully support that. Tunnelling will always be difficult and unpredictable. The initial stages of the Channel Tunnel were delayed by months, at both ends, due to unforseen ground conditions. This in spite of numerous core samples having been taken. I seem to remember that a cross section...

That's how I read and interpret it! 1.4 metres isn't that much in the right ground conditions. Some tunnelling advances much more than that followed by shotcreting to hold it together before the lining is placed. --- old post above --- --- new post below --- From Wikipedia and somewhat...

That looks like straw!. There appears to be what looks like a bale of straw on the tunnel floor to the front left of the dumper in the picture at the top of the NR press release. Quite how straw comes into the process I don't know. Temporary void filling perhaps? --- old post above --- ---...

All the World's monorails are listed Here

The condition of the tunnel was such that something needed to be done irrespective of electrification.

The pictures, at the bottom of the press release, of the material that has fallen in are amazing. Looks like it has fallen in up to the grassy ground surface above the tunnel.

Many thanks for the additional information. Yes, "cut and cover" is the term for that type of construction. Something that does not seem to be generally known for that particular tunnel. I wonder if the second smaller tunnel was constructed in the same way.

Although a different type of TBM, according to this video from Crossrail the lining segments are assembled within the shield. At least one lining ring is always within the shield. I would expect Fillie to be be similar in this respect, so there is never any possibility a roof fall.

I notice the dumpers being used are Volvo A30E, which are slightly smaller than the type I had assumed. The heaped capacity is 17.5 cu metres, which works out at 3.5 loads per metre of tunnel bored. --- old post above --- --- new post below --- I don't have a definitive answer, but if I were...

I wonder how frequently the dumper exits the tunnel. My estimates in Post #1538 would suggest that if the dumper is exiting with a load every 2 hours over a 24 hour period, then they should be tunnelling at a rate of about 4 metres per day. Not enough, but at least progress.

The RAIB report referred to relates to the King's Lynn line. In this case MENTOR recorded the problem, but nobody looked at the results. Roger Ford wrote an article in Modern Railways based on the findings of the RAIB report. Although highlighting a maintenance issue which was on single...

Following a bad spate of overhead line incidents on the ECML and MML a couple of years ago I emailed Roger Ford just as he had announced in his Blog that he was off to an electrification conference. In my email, somewhat with tongue in cheek, I suggested to him that OLE, at least in the UK...

And GE. See this promotional film from around 1949

They are 'T' section grooves cast into the concrete and filled with polystyrene foam. i.e. 'T' section polystryrene strips are cast into the concrete as part of the formwork. The grooves are used for attaching ties which are bonded into the stone external cladding. The polystyrene just gets...

Following yet another email to Oxford - Bicester collaboration, they have now updated the London Road LC closure dates published on their website to October 11. Thus confirming the dates given on the roadside signs.