UP did use a turqouise color on Signals
Author: Vance Pomerening
Date: 03-28-2008 - 09:07
In 1970 I photo'ed a green signal at Machlin Spur Ca. (between Walnut and Spadra)It was the intermediate EB signal for Spadra siding. It stayed in that paint for probably about a decade, and then was repainted silver. The color was similar to zinc chromate aircraft primer.