   city hall, also known as city hall loop, was the original southern terminal station of the first line of the new york city subway, built by the interborough rapid transit company (irt), named the "manhattan main line", and now part of the irt lexington avenue line. opened on october 27, 1904,{{cite news |url=http://query.nytimes.com/mem/archive-free/pdf?_r=1&res=9e06efd71230ee32a2575bc2a9669d946597d6cf |title=our subway open, 150,000 people try it |date=october 28, 1904 |work=the new york times 
Defunct_Interborough_Rapid_Transit_Company_stations Former_elevated_and_subway_stations_in_Manhattan IRT_Lexington_Avenue_Line_stations Railway_and_subway_stations_on_the_National_Register_of_Historic_Places_in_Manhattan Railway_stations_closed_in_1945 Railway_stations_opened_in_1904