Sleeper stacks

I've been spotting stacks of sleepers recently. Yes I know how sad that sounds but you're reading this so stop laughing.

The first was at Quorn on the GCR. Presumably concrete sleepers will chip if you bundle them together, these have been neatly piled up with wooden sleepers between them.

I'm not sure what you do if there's no wood available and thinking about it, I don't recall ever seeing piles of concrete sleepers. Track panels yes, but there you have rail between the crumbly bits.

Over at the GWR, I found this pile. Not sure what these sleepers are used for. Track that is to be inlaid with concrete perhaps?