Chicago, May 12, 1919. "Return Parade for the 13th Railway Engineers, Michigan Boulevard." During World War I, the regiment known as the 13th Engineers consisted of personnel from the six largest railroads that ran through Chicago; it operated about 142 kilometers of French railways, serving the Verdun-St. Mihiel, Champagne-Marne, and Meuse Argonne sections. The scan is from a family photo album titled "My Vacation Days," dated 1914 to 1922. View full size.