Bi-polar No. 10250 shown in its way to the 1933 Century of Progress Exposition in Chicago. Unique in both appearance and design, the railroad’s five Alco-GE bi-polars were the star performers of the passenger fleet for nearly 40 years.
from "A Proud Era Passes"
Prepared by The Public Relations Department of the Chicago, Milwaukee, St. Paul and Pacific Railroad Company as a special supplement to the July-August 1973 issue of The Milwaukee Road Magazine