This video on Youtube had me so excited I was ready to buy a Dreyfuss Hudson, kind of a must have for steam locomotive aficionados though I've yet to pull the trigger. I take it when the video was colorized the colors of the engines and cars became the various shades due to what, light when video was shot, dust/dirt/rust particles on the trains, or what else? The scenes that show the Dreyfuss in Milwaukee Road Hiawatha colors would be my first choice of a fantasy production run. From reading other threads, I take it the real Dreyfuss was a lighter to mid-hue grayish color, or wasn't that decided? Certainly, someone, somewhere must've used color film to photograph the real McCoy.
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