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The Marti group has some very interesting videos about rail tunnels. Some are also in English. https://youtube.com/@martigroup?si=zmrJ4mZOM82BTKfS https://youtu
by seb1204 2y ago
The Marti group has some very interesting videos about rail tunnels. Some are also in English.
https://youtube.com/@martigroup?si=zmrJ4mZOM82BTKfS https://youtube.com/@martigroup?si=zmrJ4mZOM82BTKfS