Prototype cargo wagon

Hi All     Waiting for a train at my local station, I can’t believe it. Two freight trains went by, in opposite directions one was a train of “ cargo wagons “ which were so rusty if one hadn’t seen a clean variant of the stock one would have been pressed to identify it, the other train was almost as bad but I couldn’t identify it. But both the trains were “ over the top as far as modelling is concerned, or is there someone who has done Red Rust wagons !  vans or tankers.  Best wishes Kevin