The "Road" also painted their passenger car roofs a medium brown color, prior to 1935 when the first series of Hiawatha cars were introduced. construction on these started in 1934 and they were the first full length, lightweight streamlined, passenger cars ever built. (They were also the only lightweight passenger cars that were built with vestibules at both ends.) This production run of some 40 cars was originally planned to have the brown roofs, but that color scheme just didn't look right on them. And, besides the Class "A" Atlantics were to be a prominent medium graym so that became the roof color of choice until about 1950, when they changed the color to black.
I always thought that the Milw's orange and maroon was just the most beautiful color scheme ever used, and when they changed to U.P. Yellow and red with gray roofs, in 1955, the Milwaukee lost it's identity and began it's long, painful journey into oblivion.
Paul Fischer