I call this the "poop sled" or "cruise ship" (see that story here).
It's exactly what it sounds like, the place to scoop the poop in to haul it to the compost pile. It works great as long as there is snow or ice on the ground. I actually prefer it to the summer time use of the wheel barrow.
In that picture, I would throw the scoop of poop over the fence, so it was the easiest to haul it to the compost pile. This is actually why I advocate for shorter fence lines, you can't throw poop over tall fences :)
We have quite a few pens to clean up, so this sled has been getting a lot of use.