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ALCO S4 DCC Ready Diesel Locomotive - HO Scale. Alco's 1,000-hp S4 switcher was the fourth entry in the company's highly successful "S" series of diesels. Their sturdy construction and ease of maintenance made them popular with a wide variety of railroads. Bachmann is pleased to offer the S4 in this DCC-ready model with factory-installed 8-pin socket for the DCC decoder installation of your choice. Features include: operating headlights, die-cast chassis, die-cast fuel tanks and underframe, E-Z Mate Mark II couplers.