I found this photograph at my link page Fallen Flags.Org, which is located to the right of your computer screen at www.rr-fallenflags.org
Railfan photographer Bill Navari, captured Atchison, Topeka & Santa Fe Railroad Alco S 2 yard switcher # 3274, at an unspecified location wearing a fresh coat of black and silver 1950's era Santa Fe colors. This color scheme which the Santa Fe used on their yard switchers and early hood unit diesel locomotives like the EMD GP 7, was in daily use by the Santa Fe from 1950 to 1960, and was refered to as the Santa Fe's "Zebra Stripe" color scheme.
Although the Santa Fe replaced this color scheme with a blue and yellow color scheme in 1960, there were several yard switchers operating at terminals system wide in the 1950's color scheme in to the mid to possibly the late 1960's, that did not get repainted right away.
This is a "Rare" color photograph from possibly the 1950's, that shows how these locomotives looked like in fresh black and silver Santa Fe zebra markings.