The Metropolitan also introduced the Ninth and Columbus Avenues Line, a combination of the Ninth Avenue Line (from the Cortlandt Street Ferry) with the Columbus Avenue Line, a former cable railway line, as well as the Sixth and Amsterdam Avenues Line, an extension of the Sixth Avenue Line west on 59th Street and north along the Ninth and Amsterdam Avenues Line.
The Metropolitan expanded its network by introducing the Ninth and Columbus Avenues Line, which merged the existing Ninth Avenue Line with the former cable railway line that ran along Columbus Avenue. Additionally, it extended the Sixth Avenue Line west on 59th Street and north along the Ninth and Amsterdam Avenues Line.