Wicked! That's one big car, they come in up to 86 feet length! These cars carry items like car interior part and other light but voluminous stuff. No auto plant whould be complete without lots of these standing around.
Where do these come from? I have the NSAND as well but so far only have run auto racks up and down the auto plant.
Did you want to resemble unpainted aluminium, as one can expect such cars to be made of lightweight materials?
Like Corten steel, unpainted aluminium is still often laquered with some clear gloss finish to make it look neat and clean longer. Or it that anodised aluminium, how are aircraft finished for example? Both materials are often used in trendy high tech architecture, sculptures and such. Just go to the nearest business park and see for yourself.
Great route, NSAND, that needs great cars and engines.