Okay, so the first official red/silver Super Fleet GE didn’t arrive until 1990, but Santa Fe’s 1960s passenger U28CGs, with it’s large red Santa Fe on the long hood, looked like a harbinger for things to come 20+ years later. If it weren’t for the vertical yellow stripe on the nose and lack of yellow striping on the side, these U28CGs can almost be mistaken for much later Super Fleet GE. This is the closest thing to what a spartan cab B40-8 or GP60 would have looked like if ATSF decided to repaint them into red and silver.
Yeah, the U28CGs had a so-called simplified version of the warbonnet, which ATSF didn’t carry over to the cowl-body U30CG or EMD FP45s. U30CGs and FP45s had the same warbonnet styling as the passenger F-units and Alco PAs.
Why paint 'em back? They spent a large portion of their career hauling the Super C around. (and nobody since has consistently matched that performance)
The later Super Fleet locos look more like the original F-unit Warbonnet. The U28’s and their Warbonnet paint looks odd without the Safety Cab but this model and the Super Fleet GP60M’s both had problems with derailments. That ended the U28s’ passenger career in 1969 and were retired in 1980.