Found this in some directions for an old HOn3 kit to assemble the WSL Powdere House snow plow. The directions recommended the following paint mix. 20 parts Box Car red, 20 parts Reefer Orange, 5 parts Reefer White, and 2 parts Caboose red. This formula was for using Floquil paints and matched a sample from wrecked Caboose #2. The paint isn't available anymore but the ratios might help matching a paint chip at your local Lowe's/Home Depot.