In 1948, Samuel S. Schreiber was appointed as general manager of the Third Avenue Transit Corporation. An experienced transit executive, he was hired to implement the orderly conversion of the remaining trolley lines to bus operation. Slowed briefly by wartime restrictions on gasoline and tires, all streetcar lines in Manhattan and the Bronx were converted to bus by the end of 1948. The remaining Mount Vernon and New Rochelle trolley lines followed on December 16, 1950. The last TARS streetcar operation came to an end in November 1952 with the closure of the former Yonkers Railroad lines.