And this here is correct. I know the folks in Topeka which designed this one, and that is exactly it.



>
> Here's a possible answer: "We have had several of
> these in our shop over the last few months. It is
> just basically a metal box that mounts around the
> stack to hold a plate over the stack to block it
> off for storage. Once out of storage they just
> leave the box in place instead of removing it. A
> little more sturdy than the vinyl covers we used
> to use."
> [cs.trains.com]