The existing 169th Street station provided an unsatisfactory terminal setup for a four track line, and this required the turning of F trains at Parsons Boulevard, and no storage facilities were provided at the station. Therefore, the line was going to be extended to 184th Place with a station at 179th Street with two island platforms, sufficient entrances and exits, and storage for four ten-car trains. The facilities would allow for the operation of express and local service to the station. Construction on the extension started in 1946, and was projected to be completed in 1949. The extension was completed later than expected and opened on December 11, 1950. This extension was delayed due to the Great Depression and World War II. Both E and F trains were extended to the new station.