No. 639 was used for freight service for Nickel plate road railroad.
The locomotive was retired from service in 1959.
It's now on display in Miller Park in Bloomington, IL.
It was donated to the City of Bloomington by the New York, Chicago & St. Louis Railroad in 1959, having racked up some 3,000,000 miles on the road.
When she's on display her tender was switched with another NKP steam engine #587, because the tender was in need of repair and 587's original tender was in good mechanical condition.