This was on the wall in the "New Shed" at Locomotion - that's a lot of empty coal waggons that need to go back to be re-filled. They appear to be livered to a mixture of merchants and mine owners.
I don't know where this is, but there must be several hundred waggons in these sidings. I recall seeing an image about the Chatterly - Whitfield colliery waggons, parked up like this after discharging into bunkers on ships berthed in Liverpool ...