The two trainsets were star attractions at the 1934 World's Fair ("A Century of Progress") in Chicago, Illinois. During its set's demonstration period, the Union Pacific named the "M-10000" as the "Streamliner", providing the first use of the term with respect to trains. The "Streamliner" 's publicity tour in February-May 1934 attracted over a million visitors and gained attention in national media as the herald of a new era in rail transportation.