Tunnel Petersberg (Germany) - Tunnel in tunnel method 

I listened. She said it was ready to resume.

Pretty much the same process our great grandfathers used.

Oh no you don't like the music and that means it's not appropriate.

Jazz is the only appropriate genre for tunel in tunel excavation

@@pepperypeppers2755 ha ha yes, in 5/4 or 7/8 even, wheels within wheels. Or unorthodox Thelonious Monk.

You sound like someone who is soft and doesn’t work around the stuff actually used and built and people who build it , not designing it the MEN on the ground working like music like the one played in the background here.

@@rickmort27 Interesting. Fair enough.

The contractor hires for ability.

Swiss company

@@hebdschnure yes- but it's a project in Germany

No trains in tunnel during blasting and subsequent inspection.

*Swiss. Marti is a Swiss company.

@@uschurch Marti AG Deutschland steht auf deren Sachen

@@maltee69 ja weil das Ihr ausführender Arm in Deutschland ist. Die Firma ist aber trotzdem aus der Schweiz.

This is clearly an action film

Tunnel in tunnel method

Marti Gruppe thanks

tunnel widening system, tout simplement système d'élargissement de tunnel en français.

Doesn't this also allow trains of a larger, standard loading gauge to enter the tunnel. IIRC Germany's railways were originally constructed by a variety of different local railway companies. I would expect they didn't all have the same loading gauge, so like in most old European systems some tunnels are too narrow or too low to fit a lot of 'standard' carriage types. Increasing the loading gauge of a line is a great long term move, especially if it's current loading gauge is smaller than that on nearby lines so quite a few train types have to avoid that particular line (i.e. double-decker cars, or wide flatcars etc.) Imagine if we did this across the EU and all of our trains were actually fully interoperable across the continent. Of course, increasing the loading gauge is very spectacular in the case of tunnels, and a little bit less so with tight bridges, but outside of them, it's more about moving all kinds of obstacles out of the way of the future larger trains, oh, and shaving bits off platforms to fit the wider trains. (if the goal is to go to a wider loading gauge.) Of course this problem is much worse in the UK, where some very widespread loading gauges don't fit a flat car with a container on top.

Ah hah! Somebody else noticed.

The original tunnel was built in 1874 and back then just blasted into the rock - so it wasn't sealed against water and almost 150 years old. It had to be renovated one way or another.

If you want to use bigger trains you have to enlarge old tunnel.

It removes a safety risk. They couldn’t use both directions of track at the same time because the tunnel was too narrow to allow the trains to pass arch other at speed. Now that has been corrected and it doubles the throughput

@@theVtuberCh I know that was the premise, but it is false.

@@marioxerxescastelancastro8019 why is it false? Now they can run bigger, faster trains. Is that a lie?

@@marioxerxescastelancastro8019 how so? Where they wrong about German train regulations?