Introduction of the Pioneer Zephyr streamliner

On June 6, 1935, the Chicago, Burlington and Quincy Railroad introduced the Pioneer Zephyr, the first diesel-powered streamliner to enter regular service in the United States. This articulated three-car train, built by Budd Company, reached speeds over 100 mph on its inaugural run from Denver to Chicago. It featured advanced lightweight construction and air conditioning, revolutionizing passenger rail travel during the Great Depression. The Zephyr's success led to widespread adoption of diesel streamlining and influenced iconic designs like the California Zephyr.