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right|thumb|The Sedrun portal in July 2016
(from Romansh: Alpine Gate) was a proposed railway station to be located in the middle of the Gotthard Base Tunnel, serving the Alpine village of Sedrun in Switzerland. It was intended to promote tourism and the economy in the canton of Graubünden.
The project was put on hold as uneconomical in 2007, and then indefinitely shelved in 2012. The current multifunction station is only used for emergency stops and maintenance. The portal lies above the tunnel.
Design
thumb|Portal over the Anterior Rhine
thumb|Access to the shafts
At underground, Porta Alpina would have been by far the deepest underground train station in the world, ten times as deep as the of the Jerusalem–Yitzhak Navon railway station (the world's deepest heavy rail station), and also surpassing Hongyancun station (Chongqing Municipality) at and Kyiv's Arsenalna Metro station at . It would have connected the high-Alpine village of Sedrun and the Surselva district to a major high-speed line from northern to southern Europe. The current station, along with Faido, is one of the two multi-function stations of the tunnel.
The multifunction station is located near a crossover between the northbound and southbound tunnels and is linked to the surface by an elevator, using tall shafts and a long access tunnel, exiting over the Anterior Rhine, south of Sedrun. This access was used for the construction of the tunnel and is now an emergency exit of the tunnel. Construction costs for a fully functional passenger station were estimated at CHF 50M ($39M, €32M, or £22M) in 2005
Following renewed interest by private investors in 2012, the Federal Council decided to forgo construction for the time being, while leaving open the possibility of a similar project being implemented by a later generation. A government report stated that the Porta Alpina would have very significantly reduced the base tunnel's freight capacity (unless a dynamic passing loop were built, at a large cost for several kilometers of additional tunneling and tracks) and would have been uneconomical to operate, requiring CHF 9M of annual public subsidies.
External links
- Project website (archived link)