Expo 1933
Expo 1933, officially A Century of Progress International Exposition, was a World Expo held in Chicago, Illinois, 40 years after Expo 1893 and 100 years after the city's incorporation. Much like Expo 1893, it was so iconic to the point where it was incorporated into Chicago's flag in the form of a star.
Exhibit of Trains
Many trains and locomotives had gathered for Expo. One such is the Union Pacific Railroad's M-10000, America's first streamlined passenger train to be manufacturered. Meanwhile, the Chicago, Burlington & Quincy sent the Pioneer Zephyr, the country's first to enter revenue service. In 1934, the train happened to reach Chicago after a 13-hour "Dawn-to-Dusk" service from Denver, Colorado. The Pioneer Zephyr can still be seen in Chicago, at the Museum of Science and Industry.
The Chicago & North Western sent their Class H steam locomotive No. 3024. It was one of the larger engines on display and had a wheel arrangement of 4-8-4—four leading wheels, eight driving wheels, and four trailing wheels.