Jarlsberg Tunnel

The Jarlsberg Tunnel is a 1,750-meter long double track railway tunnel which runs through Frodeåsen in Tønsberg, Norway. Located on the Vestfold Line, the tunnel was built as part of the 7.8-kilometer 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 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.

The Jarlsberg Tunnel runs roughly north–south through Frodeåsen, a hill just north of the town center of Tønsberg. The northern entrance is located at Tomsbakken, beside County Road 35 and the southern entrance is located at Frodegata in the town center. Just south of the tunnel lies Tønsberg Station. The tunnel is 1,750 meters long, of which 1,560 meters is blasted through bedrock and 223 meters is concrete culvert. The portal on the Tønsberg side is 73 meters long.

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