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Built between April and Nov of 1995, SP placed an order for 279 AC4400CWs from General Electric. Not only was this SPs first dive into AC technology but was their largest single locomotive order (and last) in history. GE set up a maintenance shop in Denver CO to support these units. They featured Harris Locotrol II equipment for use in DPU service; although they were used for dedicated power on Colorado coal trains, they could also be found roaming the system wherever they were needed.