museum didn't have the funds to refurbish the locomotive for full operation again, it was decided to run the locomotive in place (with the driving wheels lifted off the rails using jacks) with compressed air. The museum borrowed an 1836 coach from the Pennsylvania Railroad to display on the track behind the newly rebuilt tender, and the locomotive's 100th birthday was officially celebrated on November 12, 1931. The locomotive's semi-operation was broadcast over the CBS radio network with Stanley Bell narrating the ceremonies for the radio audience. The PRR again borrowed the locomotive and rebuilt tender from 1933 to 1934 for the Century of Progress exhibition in Chicago. Unlike its earlier round-trip to Chicago under its own steam, the engine was hauled and displayed as a static exhibit. During the exhibit the Altoona Works built a operable replica, which was operated in 1940 at the New York World's Fair, while the original locomotive returned to the Smithsonian. The John Bull was displayed outside the museum one more time in 1939 at the New York World's Fair, but the museum's curators decided that the locomotive was becoming too fragile for repeated outside exhibits. It was then placed in somewhat permanent display back in the East Hall where it remained for the next 25 years. In 1964 the locomotive was moved to its current home, the National Museum of American History, then called the Museum of History and Technology. The John Bull had remained on static display for another 15 years, but the locomotive's significance as one of the oldest in existence, or its use on the first railroad in New Jersey, was not very plainly noted in the display's literature. As 1981 and the locomotive's 150th birthday approached, the Smithsonian started discussions on how best to commemorate the John Bull's age and significance. There was very little question that special publications and exhibits would be prepared, but museum officials were left with the thought that the exhibit could still be so much more than that. Many superficial inspections were performed on the locomotive in 1980 and it was found to be in relatively sound mechanical condition. There wasn't a significant amount of deterioration noted in these early inspections, and when the wheels were jacked off the rails, as they had been 50 years earlier, the axles were found to be freely operable. One morning in January 1980, before the museum opened