Jarlsberg Tunnel

Jarlsberg Tunnel
	The northern entrance during the late phase of construction, before overhead wire was installed
Overview
Line	Vestfold Line
Location	Frodeåsen, Tønsberg, Norway
Coordinates	59°17′03″N 10°24′22″E / 59.2841°N 10.4061°E
Start	Tomsbakken
End	Frodegata
Operation
Opened	7 November 2011
Owner	Norwegian National Rail Administration
Technical
Line length	1,750 m (1.09 mi)
No. of tracks	Double
Track gauge	1,435 mm (4 ft 8+1⁄2 in)
Electrified	15 kV 16.7 Hz AC
Operating speed	200 km/h (120 mph)

The Jarlsberg Tunnel (Norwegian: Jarlsbergtunnelen) is a 1,750-meter (1.09 mi) long double track railway tunnel which runs through Frodeåsen in the city of Tønsberg in Tønsberg Municipality, Vestfold county, Norway. Located on the Vestfold Line, the tunnel was built as part of the 7.8-kilometer (4.8 mi) double-track high-speed segment from Barkåker to Tønsberg. It is located just north of Tønsberg Station and runs between Frodegata and Tomsbakken. Most of the tunnel is blasted, although 223 meters (732 ft) is in a concrete culvert. Planning of the tunnel started in the late 1990s. Several railway interest groups advised against building the isolated segment of upgraded track without a complete plan for upgrading the entire line. Construction started in April 2009 and the new section and the tunnel opened on 7 November 2011. It was the fourth segment of the Vestfold Line to be upgraded.