The <a href="https://en.wikipedia.org/wiki/Paris_Métro_Line_1" id="mwoQ" rel="mw:WikiLink" title="Paris Métro Line 1">first line</a> of the <a href="https://en.wikipedia.org/wiki/Paris_Métro" id="mwog" rel="mw:WikiLink" title="Paris Métro">Paris Métro</a> opens for operation.