Alco was known for its steam locomotives of which the 4-6-4 Hudson, 4-8-2 Mohawk and the 4-8-4 Niagara built for the New York Central and the 4-8-4 FEF and the 4-6-6-4 (Challenger) built for the Union Pacific were fine examples.
Alco był znany z parowozów, z których 4-6-4 "Hudson" i 4-8-4 "Niagara" zbudowane dla NYC i 4-6-6-4 (Challenger) zbudowane dla Union Pacific dawały dobre przykłady.