A plan of <a href="https://en.wikipedia.org/wiki/City_Hall_(IRT_Lexington_Avenue_Line_station)" class="extiw" title="w:City Hall (IRT Lexington Avenue Line station)">w:City Hall (IRT Lexington Avenue Line station)</a>.
<a href="https://en.wikipedia.org/wiki/Interborough_Rapid_Transit" class="extiw" title="w:Interborough Rapid Transit">IRT</a>
<a rel="nofollow" class="external autonumber" href="http://www.nycsubway.org/perl/show?28416">[1]</a>