![ALCO S-6 ALCO S-6](https://upload.wikimedia.org/wikipedia/commons/thumb/7/78/Hugh_llewelyn_1231_%285963970156%29.jpg/400px-Hugh_llewelyn_1231_%285963970156%29.jpg)
The Alco S-6 (specification DL 430) was a diesel-electric switcher locomotive constructed by ALCO of Schenectady, New York; a total of 126 locomotives were built between May 1955 and December 1960. The S-6 was an improved version of the earlier S-5.
Visually indistinguishable from the S-5, the S-6 used an ALCO 251A or 251B prime mover rated at 900 horsepower (670 kW). The locomotive rode on two-axle AAR trucks, giving a B-B wheel arrangement. ALCO produced a cow-calf variant for the Oliver Iron Mining Company designated SB-8/SSB-9, two sets were produced of this version.
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