Hopefully you can see the image... On the left is a my auto salvage yard/scrap metal dealer. I can't remember where I found them, but the stacks of squished autos are really nicely done resin castings, painted multi color and weathered. I added some black thread to represent steel banding or cables to secure the loads in a gondola car.
If you can find them, they'd be a nice addition to your yard.
Lee