don't know if 3 r or 2 r scale is best, but here goes.
When building scale passenger cars, for rest room windows. I have been using clear material followed by generic waxed paper. It works well for privacy, however many real rr have fancy frosted windows, both heavyweight and streamlined cars.
I am mostly thru 24 cars in various states of finished.
Does anyone know where to obtain fancy frosted rest room windows.
mikeg