Although not a steam train, the 442 diesel-electric is no spring chicken either! "The ALCO RSD-15 is a diesel-electric locomotive of the road switcher type built by ALCO (the American Locomotive Company) of Schenectady, New York between August 1956 and June 1960, during which time 75 locomotives were produced." You can read about this train and the 798 steam train at the link below.

www.austinsteamtrain.org/about-tr...