The Common Tunnel (Norwegian: Fellestunnelen) sometimes called the Common Line (Fellesstrekningen) is a 7.3-kilometer (4.5 mi) long tunnel of the Oslo Metro which runs through the city center of Oslo Norway. The name derives from the fact that all six lines of the metro use the tunnel which runs from Majorstuen to Tøyen. The section has six stations including the four busiest on the metro.The tunnel was first built as two separate tunnels which were later connected.
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