 They spent their whole service life in SWA, except for a brief period when one of them was sent to the Avontuur Railway in the Eastern Cape for trials.However, since it jammed on the tighter curves in the Langkloof despite having one set of flangeless coupled wheels, it was soon returned to SWA.The Class NG5 were all withdrawn from service when the narrow-gauge system in SWA was regauged to Cape gauge in 1960.