Castielertobel Viaduct
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Castielertobel Viaduct Castielertobel-Viadukt |
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View from the nearby cantonal road
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| Coordinates | 46°50′07″N 09°35′36″E / 46.83528°N 9.59333°ECoordinates: 46°50′07″N 09°35′36″E / 46.83528°N 9.59333°E |
| Carries | Rhaetian Railway |
| Crosses | Castielertobelbach |
| Locale | Castiel and Calfreisen, Switzerland |
| Official name | Castielertobel-Viadukt |
| Owner | Rhaetian Railway |
| Maintained by | Rhaetian Railway |
| Characteristics | |
| Design |
Arch (1914) Fish belly truss bridge (1942) |
| Material |
Stone (1914) Iron (1942) |
| Total length | 115 m (377 ft) |
| Height | 53 m (174 ft) |
| Longest span | 25 m (82 ft) |
| No. of spans | 3 |
| History | |
| Construction start | Early 1913 |
| Construction end | Late 1913 |
| Opened | December 1914 |
The Castielertobel Viaduct (German: Castielertobel-Viadukt) is a single track railway bridge spanning the Castielertobelbach, and linking the municipalities of Castiel and Calfreisen, in the Canton of Graubünden, Switzerland. It was built between 1913 and 1914 for the Chur–Arosa railway, and is now owned and used by the Rhaetian Railway.
The viaduct is located on the Rhaetian Railway's metre gauge line from Chur to the holiday and recreation resort of Arosa (the Chur–Arosa line), and links Calfreisen with Castiel, just to the west of the Lüen-Castiel railway station.
After the Langwieser Viaduct and the Gründjitobel Viaduct, the Castielertobel Viaduct is the third largest bridge on the Arosa line. It spans the Castielertobel, a wild and deeply eroded Bündner schist gorge, and the Castielertobelbach. In similar fashion to the Landwasser Viaduct on the Rhaetian Railway's Albula Railway, the viaduct leads directly into a tunnel portal, where the Arosa line dives into the 249 m long S-shaped Bärenfalle-Tunnel.
Due to the difficult geological conditions in the Schanfigg valley, a total of 18 tunnels and 40 bridges needed to be created between 1912 and 1914 for the privately built Arosa line.
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