It branches from the Common Tunnel at Majorstuen and runs 6.0 kilometers ( 3.7 mi ) to Sognsvann .
The Sognsvann Line ( Norwegian : Sognsvannsbanen ) is a rapid transit line on the Oslo Metro of Norway .
Sognsvann Line branches from the Common Tunnel at Majorstuen and runs 6.0 kilometers ( 3.7 mi ) to Sognsvann .
The Sognsvann Line ( Norwegian : Sognsvannsbanen ) is a rapid transit line on the Oslo Metro of Norway .