The Atchison, Topeka and Santa Fe Railway's 3460 class comprised six 4-6-4 "Hudson" type steam locomotives built in 1937 by the Baldwin Locomotive Works for service between La Junta, Colorado and Chicago, Illinois, a fairly flat division of the railroad suited for the 4-6-4 type.
It was designed and built by the railroad's own shops in 1937.
It was rebuilt in the railroad's own shops from Illinois Central 7000 class 2-8-4 "Berkshire" No. 7038 in 1937 as an experiment to haul fast freight trains, which were growing too large for 4-6-2 "Pacific" types and required more speed than the road's 2-8-2 locomotives could manage.
The Milwaukee Road's class F7 comprised six (#100–#105) high-speed, streamlined 4-6-4 "Baltic" or "Hudson" type steam locomotives built by ALCO in 1937–38 to haul the Milwaukee's Hiawatha express passenger trains.
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