English: Outline of the Freggio and Prato spiral tunnels between the Rodi-Fiesso and Faido stations on the southern ramp to the Gotthard tunnel. Going down the southern ramp of the Gotthardbahn after the Gotthard Tunnel the line passes the station of Rodi-Fiesso in a 90° left turn, crosses to the left side of the Ticino River (Tessin) valley. There it passes the 270° Freggio Spiral Tunnel in a left turn into the left side of the valley. Leaving the tunnel the line crosses again the Ticino River valley to proceed a kilometer on the right valley side before moving through the 360° Prato Spiral T
English: Outline of the Freggio and Prato spiral tunnels between the Rodi-Fiesso and Faido stations on the southern ramp to the Gotthard tunnel. Going down the southern ramp of the Gotthardbahn after the Gotthard Tunnel the line passes the station of Rodi-Fiesso in a 90° left turn, crosses to the left side of the Ticino River (Tessin) valley. There it passes the 270° Freggio Spiral Tunnel in a left turn into the left side of the valley. Leaving the tunnel the line crosses again the Ticino River valley to proceed a kilometer on the right valley side before moving through the 360° Prato Spiral Tunnel in a right turn into the right valley side. Exiting the tunnel the line crosses again to the left valley side bridging smaller streams before passing through the Faido station and continuing the decent down the southern ramp. From Rodi-Fiesso at 945 m to Faido at 758 m the line drops 187 m along km of tracks with 26‰ being the sharpest decline in this section. The shortest beeline distance between the stations is approximately 4km. the average decline was reduced by approximately 50%%%%%%%%, reducing the power needed by the locomotives for the climb. The elevation data and inclination data were all taken from the figure Profile of the Gotthardbahn. 1914, book (or prior source predating the publication of volume 5 of Röll's encyclopedia in 1914) 33 FreggioAndPratoSpiralTunnelsBetweenRodi-FiessoAndFaidoStationsOnSouthernRampToGotthardTunnel
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Photo credit: © History and Art Collection / Alamy / Afripics
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