sentences:  The experiment was unsuccessful, but it was found by modifying the DX class locomotives with low-level intakes and modified drawgear (locomotives modified in this manner were later reclassified DXC) and adding giant extraction fans and tunnel doors would be sufficient to allow diesel operation.The decision was made to decommission the Otira electrification which was no longer capable of meeting modern requirements and was also largely worn out after 74 years of heavy use.The OtiraArthur's Pass electrification was decommissioned in 1997.