on the south african railways (sar) roster, the two locomotives were designated classes experimental 5 and experimental 6 respectively in 1912. in the sar years, tenders were numbered for the engines they were delivered with. in most cases, an oval number plate, bearing the engine number and often also the tender type, would be attached to the rear end of the tender. during the classification and renumbering of locomotives onto the sar roster in 1912, no separate classification and renumbering list was published for tenders, which should have been renumbered according to the locomotive renumbering list.