The Alco SSB-9 (spec. DL 461) was a diesel-electric locomotive of the switcher type constructed as a cow-calf set by ALCO of Schenectady, New York. These were based on the ALCO S-6, and produced exclusively for Oliver Iron Mining, who bought two sets. The 'cow' being the model S-6(spec. DL 430), and the 'calf' being the SB-8(spec. DL 431).
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