Kit contains etched brass overlays to convert either a Lima or Replica Railways MK 1 coach to a MK 1 Post Office Sorting (POS) Travelling Post Office (80356 - 80395 series). POSs are used by Royal Mail to transport and sort mail on the move. Late posting can be undertaken via a letterbox on each side of the vehicle. Kit contains etched brass sides, hinges, handles, underframe equipment boxes and full instructions.