Komatsu has announced the commencement of testing on the world's first large dump truck equipped with a hydrogen combustion engine at its Ibaraki Plant in Japan. The HD785 rigid-frame truck, developed in collaboration with German startup KEYOU, is undergoing proof-of-concept tests as a part of Komatsu's initiative to accumulate knowledge on hydrogen engine utilization for future development of hydrogen-powered construction and mining equipment. Unlike hydrogen fuel-cell technology, the hydrogen combustion engine functions similarly to internal combustion engines, utilizing hydrogen as fuel. The system is cost-effective compared to battery power and hydrogen fuel cells as it can utilize many existing powertrain components from diesel engines while emitting minimal pollution, with water vapor being the main emission. The hydrogen tank on the truck is strategically mounted near the cab to optimize hydrogen storage capacity, and additional safety measures like cameras and monitors have been integrated for operator visibility. Komatsu acknowledges safety concerns and the hydrogen fueling infrastructure shortage, committing to collaborate with industry associations to address these issues. The proof-of-concept tests will evaluate driving performance, continuous operating hours, fuel efficiency, and safety measures related to high-pressure hydrogen gas usage. In addition to hydrogen combustion technology, Komatsu is also working on hydrogen fuel-cell machinery in partnership with GM and Toyota. Other construction equipment manufacturers like JCB, Liebherr, and Caterpillar are also venturing into hydrogen technology to reduce carbon-dioxide emissions, showcasing various innovations in hydrogen-powered machines such as loaders, excavators, and engines.