Just watched on the Gold Diggers of 1933 DVD which means this was probably part of The Busby Berkeley Collection boxed set. In chronicles the train known as "The 42nd Street Special" which was a promotional tour promoted by Warner Bros. in conjunction with General Electric as it stops in several U.S. cities with the end being during the Inauguration Day of President Franklin D. Roosevelt. Several Warner stars not in the film speak to the public on the train's inaugural leave of which the only one I recognized was Bette Davis who wasn't the big star she'd eventually become at the studio. Also addressing the crowd were Jack L. Warner, vice president of the studio and Darryl F. Zanuck, then head of production. Interesting enough of a vintage promotional short and like I said, it's on the GD of '33 disc.