The CB&Q No. 5620 is an O-5A (later O-5B) class 4-8-4, built in October 1937 by the road's West Burlington shops with a Baldwin boiler. It was one of several engines fitted with security circulators in the firebox, as some others had been fitted with thermic syphons. Late in its life it was converted to an oil burner. It was one of the very last steam engines of the Burlington Route (apart from the famous and now late lamented 5632) to be retired from service, in the late 1950s. After its fire was dropped, it was stored at Galesburg, IL, until 1961, pending preservation, but was later scrapped.