CBQ S-4 #3001 was donated to the City of Ottumwa, IA, by the Chicago, Burlington & Quincy in August 1959 on the 100th anniversary of the arrival of the first train into Ottumwa on the Burlington & Missouri Railroad, later part of the CB&Q. It is on display in Ballingall Park next to the Amtrak depot.
The CB&Q ordered a total of twelve of these Hudson type (4-6-4) locomotives from Baldwin in 1930 (#3000-#3011). Designated Class S-4, they were designed for fast passenger service and went into service pulling CB&Q "varnish" passenger services such as the Ak-Sar-Ben between Lincoln, NE, and Chicago, IL (Ak-Sar-Ben is "Nebraska" spelt backwards), the Chicago, IL-Denver, CO, Aristocrat and the Black Hawk Chicago, IL–Minneapolis/Saint Paul, MN, overnight.
The S-4 was one of the most successful steam locomotives operated by the CB&Q. They eliminated the need to swap one locomotive for another on long trips, and they were also fast: one is credited with hauling ten standard passenger cars between Cochrane and La Crosse, WI, at 112 mph.