File:Pioneer Zephyr Dawn to Dusk Club.jpg

Summary
Group photo of the "Dawn to Dusk Club", passengers who rode aboard the Pioneer Zephyr during its promotional, record-setting run from Denver to Chicago on May 26, 1934 to mark the Century of Progress World's Fair.

Image obtained from the Library of Congress American Memory collection. Image credit Western History/Genealogy Department, Denver Public Library. (retrieved May 25, 2007) asserts: "The Denver Public Library encourages use of these materials under the fair use clause of the 1976 copyright act. All images in this collection may be used for educational, scholarly purposes and private study."