Common Tunnel
... that when the Common Tunnel opened in 1928 it made the Holmenkoll Line the first underground railway in Scandinavia?
... that when the <b id="mwCzw"><a href="./Common_Tunnel" id="mwCz0" rel="mw:WikiLink" title="Common Tunnel">Common Tunnel</a></b> opened in 1928 it made the <a class="mw-redirect" href="./Holmenkoll_Line" id="mwCz4" rel="mw:WikiLink" title="Holmenkoll Line">Holmenkoll Line</a> the first underground railway in <a href="./Scandinavia" id="mwCz8" rel="mw:WikiLink" title="Scandinavia">Scandinavia</a>?