SVRy passenger car colors

There is some dispute about the color of the arch-back or turtle-back passenger cars purchased sometime between 1914-1918 from the American Car & Foundry Company. Howard Fogg's color painting, facing page 306 in "Mixed Train Daily" (by Beebe and Clegg, 1947), shows two salmon-pink coaches bringing up the rear of a mixed train rolling through Boulder Gorge, while the chapter titled "Stump Dodger" in "Oil Lamps & Iron Ponies" (by Shaw, Fisher, and Harlan, 1949) states that all SVRy passenger equipment "was painted the olive green so common to short-line equipment until the advent of the six new passenger cars ... These showed up painted a bright chrome yellow and remained so until the end." (pages 87-88)
Some of those cars are owned now by the White Pass & Yukon Railroad, so it may yet be possible to get an authoritative answer to the color question by examining paint scrapings.
It would be great if someone could tie this down once and for all.