Øverland
... that a possible extension of the Røa Line metro to Øverland was considered in the interwar period, but did not materialize?
... that a possible extension of the <a href="./Røa_Line" id="mwEUM" rel="mw:WikiLink" title="Røa Line">Røa Line</a> <a href="./Oslo_Metro" id="mwEUQ" rel="mw:WikiLink" title="Oslo Metro">metro</a> to <b id="mwEUU"><a class="mw-redirect mw-disambig" href="./Øverland" id="mwEUY" rel="mw:WikiLink" title="Øverland">Øverland</a></b> was considered in the <a href="./Interwar_period" id="mwEUc" rel="mw:WikiLink" title="Interwar period">interwar period</a>, but did not materialize?