The Atchison Topeka and Santa Fe Railway’s 3450 class comprised ten 4-6-4 Hudson type steam locomotives built by the Baldwin Locomotive Works in 1927. Built as coal-burners they were converted to oil-burning during the 1930s. At the same time the locomotives were given 79-inch driving wheels instead of their original 73-inch and the boiler pressures increased from 220 to 230 lbf/in2 (1.52 to 1.59 MPa).
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