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The General Electric Universal Series (often nicknamed U-Boats by most enthusiasts) is a series of four-axle and six-axle diesel locomotives built between the mid-1950's to the early-1970's. They were very reliable (despite numerous malfunctioning issues which were reported on later units per CSX and preceding ancestors which were the original owners), and were built to compete with ALCO, EMD, and Baldwin. After the closure of the ALCO, Fairbanks-Morse, Erie, and Baldwin locomotive companies, GE became arch rivals with EMD; thus, the Universal Series being the main competition to EMD's 567 and 645-engined diesel locomotives (such as the GP35 and SD40-2).