Just playing around with rail coloring. It is a greenish brownish kinda color for the base color and later after ballasting they will receive some light airbrushing with a rust color and grimy black mix, at that time I can also over spray the ballast. I went this route because a popular journal oil used (made by Texaco) I think?? had a greenish tint to it. It appears slightly greener in the photo's then it is in person.