Flathead Tunnel

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The Flathead Tunnel is a 7-mile (11 km) long single track railroad tunnel through the Rocky Mountains approximately 42 miles (67 km) to the west of Whitefish, Montana. It is the second-longest tunnel in the United States. The construction of Libby Dam required the relocation of 60 miles of the Burlington Northern Railroad tracks and the building of a new tunnel which opened in 1970. The east portal has a door that can be closed and fans to ventilate the tunnel. It is currently part of the BNSF Railway system and used by Amtrak's Empire Builder.