For the 1966 and 1968 calendars, General Electric U25B locomotives replaced the F3 locomotives that appeared on the 1964 calendar. Frisco had also painted its freight locomotives in a red-and-white scheme reminiscent of its no-longer-operating red-and-silver passenger streamliners. This was much cheerier than the black-and-yellow scheme used on the F3s and other early Diesels.
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Frisco acquired its first U25B locomotives in 1961, although the locomotive pictured on the calendar was acquired in 1963. The first seven that it received from General Electric — numbers 801 through 807 — had high hoods on the short as well as long end. Starting with 808, the locomotive leading the train in the calendar image, the U25Bs had low short hoods, offering engine crews much better visibility.
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It seems a little odd that Frisco would still be featuring this locomotive on its 1968 calendar, when it was nearly five years old. In 1965, the railroad had received GP35 locomotives from General Motors, and you’d think they would want to promote their latest motive power. But perhaps they just didn’t want to be bothered with redesigning the calendar.