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The Cassanawald tunnel is a 1,230 metres (4,040 ft) long tunnel on the A13 road in Switzerland, at an altitude of 1600 m.
It is a few km northeast of the San Bernardino tunnel and southwest of the Roflatunnel.
Unusually, a railway was laid through the road tunnel in order to ease access for maintenance and fireproofing work.
References
Cassanawald tunnel Wikipedia(Text) CC BY-SA