+1 on auto carrier. My Dad hauled new cars for many years off a rail hub in Mpls, MN. The new cars originally arrived exposed on rail cars, but too frequently were targets of rock throwers, etc. Manufacturers, however, still wanted the free advertising of the new cars being visible as transported, so the see-through but protected train car came about. (Remember when the model change and new appearance of a car was a hugely anticipated event?)