percent. Both platforms at the 149th Street station were extended to the east. On January 23, 1911, ten-car express trains began running on the West Farms Branch. The platforms at the Mott Avenue station were only eight cars long. Dual Contracts The Dual Contracts, which were signed on March 19, 1913, were contracts for the construction and/or rehabilitation and operation of rapid transit lines in the City of New York. The contracts were "dual" in that they were signed between the City and two separate private companies (the Interborough Rapid Transit Company and the Brooklyn Rapid Transit Company), all working together to make the construction of the Dual Contracts possible. The Dual Contracts promised the construction of several lines in the Bronx. As part of Contract 3, the IRT agreed to build an elevated line along Jerome Avenue in the Bronx. The Jerome Avenue Line station opened as part of the initial section of the line to Kingsbridge Road on June 2, 1917. Service was initially operated as a shuttle between Kingsbridge Road and 149th Street. Through service to the IRT Lexington Avenue Line began on July 17, 1918. The line was completed with a final extension to Woodlawn on April 15, 1918. This section was initially served by shuttle service, with passengers transferring at 167th Street. On August 1, 1918, the Broadway–Seventh Avenue Line opened south of Times Square–42nd Street, thereby dividing the original IRT line into an "H"-shaped system. Through service began on the new east and west side trunk lines. In 1920, a project to extend the Mott Avenue station platforms to the west to provide a connection with a proposed station on the New York Central Railroad was completed. Post-unification The Mott Avenue station became the Grand Concourse–149th Street station on March 13, 1934, after Mott Avenue was renamed the Grand Concourse. The city government took over the IRT's operations on June 12, 1940. The IRT routes were given numbered designations with the introduction of "R-type" rolling stock. These fleet contained rollsigns with numbered designations for each service. The first such fleet, the R12, was put into service in 1948. The route from the Broadway–Seventh Avenue Line to the White Plains Road Line became known as the 2. The route from the Lexington Avenue Line to the Jerome Avenue Line became the 4, while the route from the Lexington Avenue Line to the White Plains Road