Flathead Tunnel
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The Flathead Tunnel is a 7.01 mile (11.3 km) railroad tunnel in the Rocky Mountains approximately 42 miles (67 km) to the west of Whitefish, Montana. It is the second-longest tunnel in the United States. Speed through the tunnel is approximately 50 mph (80 km/h).
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[edit] History
The construction of Libby Dam required the relocation of 60 miles (≈100 km) 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.[1] It is currently part of the BNSF Railway system and used by Amtrak's Empire Builder.

