The <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Tremont_Street_Subway" id="mwyw" rel="mw:WikiLink" title="Tremont Street Subway">Tremont Street Subway</a> in Boston opens, becoming the first underground <a href="https://en.wikipedia.org/wiki/Rapid_transit" id="mwzA" rel="mw:WikiLink" title="Rapid transit">rapid transit</a> system in North America.