KIWIRAIL’S DM CLASS LOCOMOTIVES: A NEW ERA FOR RAIL
EXTRA NEWS SPOTLIGHT
ENGINE AUDIT TESTING COMPLETED FOR PLASSER AUSTRALIA Terra Cat played a key role in completing engine audit testing for Plasser Australia, marking a major milestone in the commissioning of the first of four new Cat C13B- powered Plasser track maintenance regulator units. As the official supplier of the Cat C13B engine, Terra partnered with Energy Power Systems Australia (EPSA) to provide onsite technical expertise and specialised testing equipment. This collaborative effort was essential in securing final engine installation signoff, a critical step in the rollout of these advanced maintenance machines.
KiwiRail has recently celebrated the arrival of two additional DM class locomotives at Lyttelton Port, doubling the South Island fleet from two to four. Manufactured by Swiss rollingstock company Stadler at its Valencia, Spain facility, these locomotives are part of a major order of 66 units. Over the coming years, 47 will be deployed across the South Island and 19 in the North Island, strengthening KiwiRail’s network nationwide.
Rail account manager Brett Congalton said the project
At the heart of each locomotive is the Cat C175-16 diesel engine, engineered for strength, efficiency, and sustainability. Delivering 3,000 kW (4,023 hp) at 1,800 rpm, the C175-16 provides the kind of muscle needed to haul heavier loads and tackle New Zealand’s demanding terrain. Its broad operating speed range and high-power density mean fewer locomotives are required per train, giving KiwiRail greater reliability and flexibility in its operations. These engines are not just about raw power. They meet the stringent EU Stage V emissions standards, ensuring significantly lower exhaust emissions than the ageing DX fleet they're replacing. Combined with idle-reduction technology and an auto engine start stop (AESS) system, the locomotives conserve fuel whenever they're not in motion. A Driver Energy Reduction and Advisory System further enhance efficiency by guiding operators to achieve optimal energy performance. Together, these features make the DM locomotives both cleaner and smarter, setting a new benchmark for sustainable rail transport in New Zealand. For KiwiRail, the new locos will significantly improve efficiency. Not only do they have a cab at each end,
reducing some of the need to run two locos on freight trains, but they also have modern traction control, to better use the more powerful high-speed engine. Rail already produces approximately 70 per cent fewer emissions per tonne carried compared to heavy road freight, and KiwiRail expects the new DM locomotives to cut South Island fleet emissions by a further 20 to 25 per cent. For customers, this means more reliable freight services. For New Zealand it represents a significant step toward climate goals. The DM locomotives may be the face of KiwiRail’s future, but it is the Cat C175-16 diesel engine that provides the muscle, efficiency, and sustainability to carry the railway into a new era. Terra Cat is proud to support KiwiRail in the rollout of the new DM class locomotives, providing comprehensive technical expertise, warranty services, and parts support to ensure a seamless and successful introduction.
highlighted seamless teamwork between Terra Cat, EPSA, Plasser Australia, and KiwiRail. Testing was completed two days ahead of schedule, thanks to the dedication of all involved.
Photos: Glen Anthony
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