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Jarlsberg Tunnel
The Jarlsberg Tunnel ((ノルウェー語:Jarlsbergtunnelen)) is a 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 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 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.
==Specifications==
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 long, of which is blasted through bedrock and is concrete culvert. The portal on the Tønsberg side is long.
The Jarlsberg Tunnel constitutes the southernmost part of the double-track segment of the Vestfold Line between Barkåker and Tønsberg.〔 It is electrified at , has an NSI-63 signaling system and is dimensioned for . The crosscut serves as an emergency exit.〔 The railway tunnel crosses above the Frodeåsen Tunnel, a twin-tube tunnel of County Road 300. The tunnel's single crosscut serves as an emergency exit.〔 The line is owned and maintained by the Norwegian National Rail Administration.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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