In the realm of truck manufacturing, the debate on hydrogen as a sustainable energy source is evolving beyond fuel cells to include hydrogen combustion engines. Fuel cells, which generate electricity from the chemical reaction of hydrogen and oxygen, have been a long-standing beacon of hope for decarbonizing road freight transport. They offer constant energy with water vapor as the only byproduct, simplifying production and allowing for recuperation of braking energy. However, challenges such as ensuring clean gas input and complex cooling requirements persist. On the other hand, hydrogen combustion engines present a promising alternative, resembling traditional engines and demonstrating higher efficiency for heavier loads and demanding routes. These engines can utilize existing diesel engine architectures and incorporate hybrid drives for enhanced energy recovery. Overall, the future of hydrogen in truck manufacturing appears bright, with both fuel cells and combustion engines offering unique benefits and opportunities for the sustainable transformation of the transport industry.