Meet Crossrail's giant tunnelling machines

  • 🎬 Video
  • ℹ️ Description
Meet Crossrail's giant tunnelling machines 4.5
Crossrail will use eight tunnel boring machines (TBMs) to construct the new tunnels under London. These huge machines will work 24 hours a day beneath the streets of London, excavating large volumes of ground and erecting the concrete tunnel lining.

Each machine has a rotating cutter head at the front, and a series of trailers behind, housing all the mechanical and electrical equipment required for the excavation of material.

To construct the 42km of tunnel required for Crossrail the tunnel boring machines will undertake ten individual tunnel drives to construct the 6.2m diameter rail tunnels.

Each TBM weighs approximately 1000 tonnes and will be up to 140m in length with an external diameter of 7.1m. This allows for an inside tunnel diameter of 6.2m once the concrete tunnel segments are in place.

Each TBM will be operated by a 'tunnel gang' comprising of around twenty people - twelve people on the TBM itself and eight people working from the rear of the machine to above ground.

To find out more about our tunnel boring machines visit:

💬 Comments on the video

It's a BORING job, but somebody's got to do it!!!

Author — Growly Bear


This is a really informative video explaining how the tunneling works and is really clear and easy to follow. As a Physicist I could watch these videos all day.

Author — Gladys .Pickering


why does the guy raise his voice at the end

Author — gdfsk


Is this the same model of machine used by the government to create their Deep Underground Military bases, for the past 50 years?

Author — Crunchy Bob


6.22 looks as if almost the entire country is a suburb of London.

Author — stereopolice


Whats the power requirement of a TBM...50-60MW?

Author — TheMotorman


Clear, informative videos like this are part of what makes the Internet so great.

Author — IARRCSim


how can they tell if they are digging through archaeological findings?

Author — Survive the Jive


Cool i love mine things and tunnel things:D

Author — JustThijsGaming - Elke week een nieuwe video


A lot of information to take on board there

Author — MissIrishdoll


I just wanna thank you for letting me understand this since ai always wonder how the tunnels were/are built!

Author — Waiki Tuimaseve


Can you say "massive" reminds me of the goofers digging in my yard, but these machines could dig through a whole country.

Author — Lance Winslow



Author — Mesut Bilgisayar San Tic Ltd Şti


Any of you going to tell me the real reason for the tunneling to and from all walmarts in America ?

Author — Ashley Nicole


Great video!! will help out for my exam!!

Author — tmojicar


I want a free program to make animations like that. Very educational. I wondered how that worked.

Author — Steve Wolfe


but what happens if in front of that beast there r some important ancient stuff?
how they see them?
or.. they dont?!

Author — Palemaster13