In 1915, the IRT considered constructing a new mezzanine and entrance at the southern end of the station leading to the central mall of Broadway at 94th Street, with an estimated cost of $60,000. The additional entrance would have reduced congestion at the station, and reduce travel times for people south of 94th Street. In addition, two additional staircases would have been constructed to each island platform. Plans were prepared in 1923. Though the IRT sent a proposed agreement for the construction of the entrance to the New York City Board of Estimate, the Board of Estimate suggested that staircases be constructed on the sidewalk. The IRT decided not to pursue this option since it would cost twice as much, or $100,000, and decided not to construct a new entrance at the southern end of the station at the time. In 1918, the Broadway–Seventh Avenue Line opened south of Times Square–42nd Street, thereby dividing the original line into an "H" system. The original subway north of Times Square thus became part of the Broadway–Seventh Avenue Line. Local trains (Broadway and Lenox Avenue) were sent to South Ferry, while express trains (Broadway and West Farms) used the new Clark Street Tunnel to Brooklyn.