They were only $6 in the hobby shop, they were some really cheap Bachmann cars.
As soon as I took them out of their boxes the wheels fell out of the bogies so I figured that was a sign.
So I chopped the ends off to use like in the header photo and sliced the sides and roof up. The bits are drying after being sprayed all kinds of dirty rusty colours.
Bingo! The start of a scrap pile...