Carmakers are exploring innovative solutions beyond electric vehicles, with a focus on opposed piston engines combined with hydrogen fuel. The opposed piston engine, with a history dating back over a century, features two pistons in each cylinder moving in opposite directions, yielding more power while consuming less fuel. Achates Power and similar companies are reigniting interest in these engines, particularly when paired with green fuels like hydrogen. This combination shows great potential for revolutionizing long haul trucking and commercial vehicle transport. The unique technical arrangement of opposed piston engines results in efficient combustion, high power density, and reduced engine complexity. By eliminating components like the cylinder head and valvetrain, these engines offer increased fuel efficiency and lower emissions. The usage of hydrogen as a fuel source further enhances these benefits, offering a carbon-free energy solution with greater energy density than diesel. This advancement is especially crucial for heavy vehicles like long haul trucks, optimizing freight carriage capacity while significantly reducing weight compared to diesel tanks. The reissue of a World War II hydrogen engine highlights the importance of hydrogen as a fuel source, emphasizing its green and blue fuel extraction methods for automotive use. Brands like Toyota and Hyundai have made significant strides in adopting hydrogen fuel technology, showcasing its potential for sustainable mobility.