The Superb was used as U.S. President Warren G. Harding's personal Pullman railroad car in a cross-country tour in 1923. After Harding's death, the car returned his body from San Francisco to Washington, D.C.. Built in 1911, it is the second oldest steel private car in existence. It had been used by Woodrow Wilson. In 1926 it was temporarily renamed Pope Pius XI for the Cardinal's Train from New York City to Chicago.