C16 Cambrian Models Sea Horse 41tonne Ballast Wagon kit.
Seahorse wagons were converted from OCA wagons during 1989 & early 1990, & total 30 wagons.
They were initially used to carry ballast from Meldon Quarry in Devon, to Hoo Junction in Kent.
This was to create a stockpile of ballast to refill half-empty Seacow/lion hoppers.