What has a station on 23rd Street and Sixth Avenue in Chelsea and is operated by the Port Authority of New York and New Jersey?
23rd Street station (PATH): 23rd Street is a station on the PATH system. 23rd Street station (PATH):  Located at the intersection of 23rd Street and Sixth Avenue in the Chelsea neighborhood of Manhattan, New York City, it is served by the Hoboken–33rd Street and Journal Square–33rd Street lines on weekdays, and by the Journal Square–33rd Street (via Hoboken) line on weekends. PATH (rail system):  The PATH is operated by, and named after, the Port Authority of New York and New Jersey.
PATH