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The railroads didn't ask for cab units. They had realized road switchers were easier to run (better view backwards) and easier to maintain. And weight saving wasn't necessary for freight units. The FP45 wasn't a cab but a cowl unit. It is a SDP45 with a full width hood. While on cab units the side walls were load carrying on cowl units the hoods were just for the ride. ATSF wanted a cowl unit for their prestige passenger trains. The didn't like the look of a freight road switcher up front, though they started with a GE U28CG. ATSF bought the F45, a SD45 with full width hood, for aesthetics. GN to protect its crews from the hard winters in the north. After bad experiences with six-axle locomotives (EMD SDP40F, GE E60CP, E60PH, P30CH) Amtrak decided to use four-axle locomotives. The GE AMD103 Genesis (P40) was the first cab locomotive in a long time with a monocoque design. It saved 20,000 lbs weight and allowed more horsepower, and a larger fuel tank. Regards, Volker
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