With its theme song, "I've Been Working on the Railroad", the series began on ABC October 4, 1948 as a 45-minute program, advertised as "World's Greatest Musical Comedies." It was reduced to 30 minutes on April 25, 1949, continuing until September 26, 1949. It then moved to NBC for a run from October 3, 1949, until June 21, 1954.