facilities would allow for the operation of express and local service to the station. On August 1, 1946, the Board of Estimate approved the plan for the extension of the line, which was estimated to cost $10.3 million, of which, $7,764,000 would go to construction, with the remainder for subway cars, power substations, third rail and signal equipment, and other electrical equipment. The project was expected to be completed within five years of the date that the contract was awarded. On October 22, 1946, it was revealed that work on the extension might begin in early November as the BOT prepared to award the contract to Van Wagner Construction Company, which submitted a low bid of $5,284,888. The contract called for the extension's completion within two years. The extension was to be constructed using cut-and-cover and required the relocation of underground sewer and electrical lines. Construction on the extension started in 1947 and was projected to be completed in 1949. The extension was completed later than expected and opened on December 11, 1950. E trains were extended there at all times and F trains were extended evenings, nights, and Sunday mornings. On May 13, 1951, all trains outside of rush hour were extended to 179th Street using the local tracks beyond Parsons Boulevard. On October 8, 1951, trains were extended to 179th Street at all times. During rush hours, F trains skipped 169th Street running via the express tracks. At other times, the F stopped at 169th Street. Late 20th century In 1953, the platforms were lengthened at 75th Avenue and Sutphin Boulevard to to allow E and F trains to run eleven car trains. The E and F began running eleven-car trains during rush hours on September 8, 1953. The extra train car increased the total carrying capacity by 4,000 passengers. The lengthening project cost $400,000. The operation of eleven-car trains ended in 1958 because of operational difficulties. The signal blocks, especially in Manhattan, were too short to accommodate the longer trains, and the motormen had a very small margin of error to properly platform the train. It was found that operating ten-car trains allowed for two additional trains per hour to be scheduled. Because local service was only offered by the GG trains which only ran into Brooklyn, riders were forced to transfer at express stations to reach Manhattan. This caused overcrowding and delays. The BOT had first