The Chicago, Milwaukee, St. Paul & Pacific Railroad bought 22 Hudsons
from the Baldwin Locomotive Works, in the early 1930s. 14 Class F-6 (road
numbers 6400 through 6413) were delivered in 1930 and eight Class F-6a (road
numbers 6414 through 6421) arrived in 1931.
In 1938, CMStP&P ordered six 4-6-4, Class F-7 Hudsons from the American
Locomotive Company and assigned them road numbers 100 through 105. These
locomotives were styled by the noted designer Otto Kuhler and were used to
lead the "Twin Cities Hiawatha". They reduced the running time for the 412
mile trip from the Twin Cities to Chicago to 6.5 hours.
