[1][3][4] Increasing traffic demands arising from the copper mines at Tsumeb led to a requirement for more locomotives.

They were designated Class Hd, numbered in the range from 40 to 42, and leased to the Otavi Mining and Railway Company for use on the section between Swakopmund and Karibib.

[1][2][5] The "Hd" classification identified the locomotive type as the fourth class to have been built for GSWA by Henschel.

This resulted in a rigid wheelbase of 17 feet 11⁄16 inch (5,199 millimetres), even though the leading carrying wheels were arranged to the rear instead of ahead of the cylinders.

[6] A postage stamp depicting the Class Hd locomotive was one of a set of four commemorative South West African postage stamps which were issued on 2 August 1985 to commemorate the narrow gauge locomotives which pioneered railways in the territory.