Tanum Tunnel
| Overview | |
|---|---|
| Line | Asker Line |
| Location | Asker and Bærum, Norway |
| Coordinates | 59°52′49″N 10°28′40″E / 59.8804°N 10.4777°ECoordinates: 59°52′49″N 10°28′40″E / 59.8804°N 10.4777°E |
| System | Norwegian railway network |
| Start | Jong, Bærum |
| End | Årstad, Asker |
| Operation | |
| Opened | 27 August 2005 |
| Owner | Norwegian National Rail Administration |
| Operator |
Norwegian State Railways Airport Express Train |
| Character | Express trains |
| Technical | |
| Line length | 3,590 m (11,780 ft) |
| No. of tracks | Double |
| Track gauge | 1,435 mm (4 ft 8 1⁄2 in) |
| Electrified | 15 kV 16 2⁄3 Hz AC |
| Operating speed | 160 km/h (100 mph) |
Tanum Tunnel (Norwegian: Tanumtunnelen) is 3,590-meter-long (11,780 ft) double-track railway tunnel on the Asker Line, between Jong in Bærum and Åstad in Asker, Norway. It was built as part of the first state of the Asker Line, between Asker and Sandvika; construction started in February 2002 and the tunnel opened on 27 August 2005. The tunnel was built by AF Gruppen for the Norwegian National Rail Administration. Most of the tunneling was conducted using the drilling and blasting method, although the easternmost 800 meters (2,600 ft) were built using the cut-and-cover method. After the tunnel opened, there have been problems with leaks damaging the superstructure. The tunnel has double track, is electrified and allows for a maximum speed of 160 kilometers per hour (100 mph). The cost to build the tunnel, excluding the superstructure, was 370 million Norwegian krone (NOK). The tunnel will accelerate intercity and regional traffic west of Oslo and free up capacity for the Oslo Commuter Rail on the Drammen Line.
The Tanum Tunnel is 3,590 meters (11,778 ft) long and has a cross section varying between 105 and 115 square meters (1,130 and 1,240 sq ft). The tunnel consists of a 2,718-meter-long (8,917 ft) blasted section and a 800-meter-long (2,600 ft), cut-and-cover section—the latter the easternmost part of the tunnel. It carries the double-tracked Asker Line between Jong and Åstad. The tunnel runs mostly through Cambrian-Silurian sedimentary slate, nodular limestone and shale, with local occurrences of Permian igneous rock. There is also a 400-meter-long (1,300 ft) section of less stable sedimentary rock in the Asker Group. The tunnel had a cover most of the way of between 50 and 100 meters (160 and 330 ft); however at Billingstad there was a much lower margin, laying for the most at 10 to 15 meters (33 to 49 ft) and at the least at 1.5 meters (4 ft 11 in). At Åstad, the line runs 600 meters (2,000 ft) in the open before entering the Skaugum Tunnel. The line is electrified at 15 kV 16 2⁄3 Hz AC and allows a maximum speed of 160 kilometres per hour (100 mph). The tunnel has frost insulation 300 meters (980 ft) into the tunnel form each end. The tunnel has frost fans which ensure that the air stays put in the middle of the tunnel, thus hindering cold air from flowing past the frost isolation.
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