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What is a "base tunnel"? Definition here.
Author: I searched it
Date: 02-19-2021 - 11:13

I keep seeing reference to the Palmdale "base tunnel" here on AP. I thought I'd Google that term, "base tunnel."

Here is what Wikipedia has:

"A base tunnel is a type of tunnel, mainly a railway tunnel, that is built through the base of a mountain pass. This type of tunnel typically connects two valleys at about the same altitudes.
...

Some of the best-known base tunnels are (with length, opening and location):

Gotthard Base Tunnel (57.1 km, 35.5 mi, 2016), Switzerland

Mont d'Ambin Base Tunnel (57 km, 35 mi, planned), France and Italy

Brenner Base Tunnel (55 km, 34 mi, proj. 2025), Austria and Italy

Lötschberg Base Tunnel (34.6 km, 21.5 mi, 2007), Switzerland

Koralm Tunnel (32.9 km, 20.4 mi, proj. 2022), Austria

Semmering Base Tunnel (27.3 km, 17.0 mi, proj. 2025), Austria

Pajares Base Tunnel (24.7 km, 15.3 mi, proj. 2012, but currently not usable), Spain

Zimmerberg Base Tunnel (20 km, 12 mi, planned), Switzerland

Apennine Base Tunnel (18.5 km, 11.5 mi, 1934), Italy

Ceneri Base Tunnel (15.4 km, 9.6 mi, 2020), Switzerland

Furka Base Tunnel (15.4 km, 9.6 mi, 1982), Switzerland

Ore Mountain Base Tunnel as part of the Dresden Prague High Speed Railway Line

Base tunnels through the San Gabriel Mountains have been proposed as part of the California High-Speed Rail system."

https://en.wikipedia.org/wiki/Base_tunnel

Now you know.

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Subject Written By Date/Time (PST)
  What is a "base tunnel"? Definition here. I searched it 02-19-2021 - 11:13
  So the only CAHSR base tunnel would be under Pacheco Pass Pay attention, Mouse 02-19-2021 - 12:56
  Re: So the only CAHSR base tunnel would be under Pacheco Pass FUD 02-19-2021 - 13:32
  Re: So the only CAHSR base tunnel would be under Pacheco Pass my understanding 02-19-2021 - 14:21
  Re: So the only CAHSR base tunnel would be under Pacheco Pass Edward Cromwelle 02-19-2021 - 15:13
  Re: So the only CAHSR base tunnel would be under Pacheco Pass synonymouse 02-19-2021 - 15:42
  Tale of the Bearded Clem LOLOL 02-19-2021 - 17:35


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