HS2 London Northolt Tunnels | TBM "Caroline" launch

[@Rail_Focus]

Rail photography on Redbbuble, prints, mugs, t-shirts and much more: www.redbubble.com/people/EngPhotography/explore?page=1&sortOrder=recent

[@seanrodgers1839]

Imagine showing an 1890s tunnel builder a TBM, he'd be astonished.

[@philtucker1224]

Just fabulous. This scale of tunnelling is awesome. I was lucky enough to be working and watching locally when the Chunnel was being built right from the start. Quality work lads, stay safe 👍🇬🇧

[@martingoffin9659]

United Kingdom Of Great Britain London, Manchester, Birmingham, Liverpool, Glasgow, Edinburgh is the best city in the world, The first railroad built in Great Britain to use steam locomotives was the Stockton and Darlington, opened in 1825. It used a steam locomotive built by George Stephenson and was practical only for hauling minerals. The Liverpool and Manchester Railway, which opened in 1830, was the first modern railroad, UK modern Train railway boost business forever.

[@davidbirdsey6489]

Very well photographed and I felt your graphic of the TBM operation was very clear and concise. I was particularly interested in the route map as I lived in the Northolt/Greenford area as a boy and went to school in Horsenden near the Green Park Way destination of Caroline and Sushila. It was a scoop getting the jinterview with the TBM director. Keep up the good work. BM

[@Rail_Focus]

Thanks, was lucky with the timing capturing the moment it was switched on.

[@RinoaL]

First video of yours I've seen, I shall remember your channel so even if KZbin doesn't recommend you, I'll still check in.

[@Rail_Focus]

Great 👍

[@joebarrett4353]

amazing and skillful engineers at their best!

[@matzk0840]

nice explanation!

[@Rail_Focus]

Thanks 🙂

[@gearoidp]

That animation was great

[@Rail_Focus]

Thank you 🙂

[@Sim0nTrains]

Nice video and explanation.

[@Rail_Focus]

Thank you 😊

[@ManicXD]

Excellent animatic, definitely helps clarify the core TBM concept!

[@Rail_Focus]

Thank you, was the easiest way I could think of trying to explain it

[@bobsrailrelics]

Looked a bit wet, but fascinating to see. Thanks for this, explained in all well.

[@Rail_Focus]

It wasn't too bad, bit gray but the rain stayed off. Glad I managed to explain it well

[@Andrewjg_89]

I be looking forward to seeing HS2 completed. Very impressive video.

[@Rail_Focus]

Thank you. HS2 is going to be incredible when it's complete

[@Andrewjg_89]

@@Rail_Focus Indeed 😄

[@davidcolley7714]

@@Rail_Focus Only 10 or more years to go and with a cost at well above £100bn. Biggest white pachyderm in English transport history

[@Rail_Focus]

@@davidcolley7714 unfortunately infrastructure doesn't appear as if by magic and takes time to construct. Also £100bn+ cost is nonsense.

[@davidcolley7714]

@@Rail_Focus That figure is far from being nonsense. The government initially estimated that HS2 would cost £37.5bn in 2009 prices. The government's official review of the scheme, which has been seen by the BBC, puts the potential cost at as much as £106bn. Remember it will take another ten or more years to complete and at the moment inflation is running at 11.052% Report after report bemoans the poor state of the railways in the north of England and Scotland. Because of this railway, Northern Powerhouse Rail has been savagely curtailed. So do you want to give a stab on how much this 200-mile railway from London to Manchester will finally cost?

[@EdgyNumber1]

What is Caroline and Sushila's projected completion date?

[@Rail_Focus]

Tunneling will take about 2 years

[@michaelstevens3479]

How many wind turbines would the train need to make each journey?

[@Rail_Focus]

Just as many/few needed as the current Pendolinos. Better wind powered trains than fossil fuel powered cars, trucks and planes.

[@SirKenchalot]

I hope the trains will move faster than 5mm a second; I've been stuck on some services that would be left in that machine's dust. How does these machines negotiate changes in elevation or tunnels with bends?

[@Rail_Focus]

I'm fairly sure each of the hydraulic rams can be independently controlled to "steer" the TBM, but also each ring segment will be a different shape to match the contours, which in part will also dictate the direction of travel.

[@ciaranmcmanus3840]

How’s the spoil coming out loose or slurry and how’s it being moved by train or truck

[@Rail_Focus]

Loose via conveyor, most used to remodel the golf course or moved by articulate dump trucks towards Colne Valley for earthworks.

[@jermainetrainallen6416]

Somehow I haven't watched this video yet but nevertheless I throughly enjoyed it. It must've been cool to witness the moment the TBM was switched on. Keep up the good work👍

[@Rail_Focus]

No worries, it certainly was a privilege to have been invited.

[@ritafarrow8734]

so you said that tbm would bore 18mts a day,and in the next breathe said that the other tbm has done about 80mts in 2 weeks ,so my sums says that does not add up right ,could we have the answers thanks

[@Rail_Focus]

Once the TBS are up to speed they hope to achieve 18m per day, that much is true. The first few weeks will likely be spent making sure everything's dialed in correctly, hence the slow start initially.

[@philtucker1224]

When operating continuously.

[@philtucker1224]

I appreciate that these subterranean links will ultimately negate the need to keep coming back up to the surface to pick up the next link.Nice work lads and lassies! 👍🇬🇧

[@rockerjim8045]

I bet there are enemies of HS2 in Hartlepool but it has provided jobs there to make the Concrete Ring Sections.

[@davidcurry4433]

I'm still waiting for someone to cost comparison tunnelling 90% of the route versus what's happening now Taking into account all CPO of land, houses, security of sites construction equipment, etc

[@Rail_Focus]

Through London tunnelling makes sense, but farmland is still relatively cheap. However, it's not just cost to consider, but energy consumption too. Above ground new high-speed trains are very efficient (using the same or less energy travelling at 320km/h than existing Pendolinos do travelling at just 200km/h) but below ground the piston effect increases energy consumption, so tunnels need to have a very wide bore and must be implemented where completely necessary.

[@davidcurry4433]

@Rail_Focus But you still haven't answered my simple question. We know the cost per mile for tunnelling. It's the same cost, whether it's the 1st mile or the 50th mile.. The size of the tunnel is irrelevant as long as it can carry a train at 200mph. Let's face it, underground wins hands-down in my eyes, and my point is it can be done, and nobody give it a thought..

[@Rail_Focus]

@@davidcurry4433 the diameter of the tunnel is relevant as the wider the bore the more material needed to be excavated and the bigger the tunnel rings need to be adding to the cost. But you can't compare the cost difference between tunneling under London and tunneling under farmland, as the value to London real estate is vastly more than open farmland. So no it wouldn't be cost effective to drive a 140 mile long tunnel. The energy requirements are also important as they would add to the operational costs and therefore further erode the benefits vs cost of tunneling. So in answer to your question, common sense tells us tunneling 90% isn't practical or cost effective and is not necessary given the relatively small impact HS2 will have on overall land take.

[@davidcurry4433]

@Rail_Focus When i say 90%, i actually mean in and out every 10-15 mile, and not a continuous tunnel. Like I've previously said, nobody's willing to do a cost comparison, all the consultations that took place, not one person was interested, im sure it's the same as Heathrow's T5, a land grab..

[@TrevorWilliams-fq8mg]

Tunelling costs per mile are not the same regardless of distance. If there are shallow foundations of buildings in close proximity they need underpinning.

[@Rail_Focus]

Intro Music by Steve ▶️ kzbin.info/www/bejne/f6mkm5l6q92Embc ◀️

[@rockerjim8045]

Hay School kids. If you want a permanent job choose a career in Tunneling

[@philipareed]

AITCH. Jesus CHRIST.

[@Rail_Focus]

Calm down, Jesus Christ

[@philipareed]

@@Rail_Focus 😂😂