Image: Porta Alpina
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Description: Gotthard Base Tunnel at Sedrun multifunction station (east tube), looking south. The vertical distance to the ground is about 1200 metres from this point. Note the waiting hall window, a remnant of the project "Porta Alpina".
Title: Porta Alpina
Credit: Own work
Author: Zacharie Grossen
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes
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