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ATSF Warbonnet F7A (No. 309)

(Here is a re-make of the default F7A and F7B livery).

The legendary Warbonnet livery was designed by Leland A. Knickerbocker, who was an artist at General Motors' styling department. It was designed for the Atchison, Topeka and Santa Fe Railroad, and was used mainly on locomotives that hauled the iconic Super Chief train, which ran between Chicago, Illinois and Los Angeles, California from 1937 to 1971. From then the train was taken over by Amtrak. This service still operates - in a slightly different state - today as the Southwest Chief.

The first locomotive to carry the Warbonnet livery were the 11-strong EMC E1 fleet that the Santa Fe had at the time. Eight of those engines were E1A's, while the rest were E1B's. The EMD F7A and F7B locomotives went on to be legendary carriers of the livery, and it was also applied to a few other locomotive types on the Santa Fe's roster:

ALCO DL-109
ALCO PA-1
EMD E8M (modified E1A's and E1B's)
EMD F3A
EMD FP45
EMD GP60M
EMD SD75M
Fairbanks-Morse 'Erie Built'
General Electric B40-8W
General Electric C40-9W
General Electric C44-9W
General Electric U28CG
General Electric U30CG

Between 1989 and 1995, all new-build engines for the Santa Fe were outshopped in Warbonnet colours.

ATSF entered a merger with Burlington Northern in 1995, creating the Burlington Northern Santa Fe Railway or 'BNSF'. After the merger, the Warbonnet livery was gradually phased out. But - as far as I know - there are still a few engines roaming around the US in this livery.