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A comment on World's longest and deepest rail tunnel to open in Switzerland. Parent comment

Re:World's longest and deepest rail tunnel to open in Switze... by elcapitan on Wednesday June 01, 2016 @06:07AM (#11813261)
It would be fun to see an "agile" tunnel project.

"This rock is too solid to drill through with our machines!" – "Ok, for now let's just drill around it and make it an underground rollercoaster instead of a railway, we can get back to the original design later!"

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Re:World's longest and deepest rail tunnel to open in Switze... by crzwdjk on Wednesday June 01, 2016 @09:49AM (#11814293)
This actually happened in St. Petersburg, when they ran into difficulties tunneling under the river on Line 2. They ended up going under the difficult section, and now there's a 6% downgrade on that section of the line, which is pretty much a rollercoaster by subway train standards.
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Re:World's longest and deepest rail tunnel to open in Switze... by tonyedgecombe on Wednesday June 01, 2016 @06:32AM (#11813343)
That's not agile, that's a pivot :)
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Re:World's longest and deepest rail tunnel to open in Switze... by Annatar on Wednesday June 01, 2016 @07:24AM (#11813515)
Not in this case, as the train is specified to go at 250 km/h, which means that the tunnel had to be pretty straight, or else the train might derail at that speed.
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Re:World's longest and deepest rail tunnel to open in Switze... by ucaetano on Wednesday June 01, 2016 @08:02AM (#11813673)
Which would make it an even more fun roller coaster!
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