After a disappointing experience with the DF class locomotives and facing significant capacity issues on the NIMT, NZR entered into an agreement with General Motors for the supply of 30 G12 model locomotives following a tender process. Designated by NZR as the DA class one of the major appeals was the guarantee of delivery within five months.
NZR's experience with the DF class locomotives and capacity issues on the NIMT led to an agreement with General Motors for 30 G12 model locomotives through a tender process. The DA class was notable as one of the major benefits due to the promise of delivery within five months.