I've noticed on some of the 50' Hi Cube box cars that the skins will change on their own after loading a saved session. I don't like graffiti on my trains and it is annoying when this happens especially if I am taking screenshots. I know graffiti is a fact of real life railroads these days, but the beauty of Trainz is that we can create the world we want. Can the graffitied skins just be removed totally from the car?