Experts at the Southwest Research Institute (SwRI) have made a breakthrough in decarbonising heavy-duty, long-haul trucking with the development of the Hydrogen Internal Combustion Engine (H2-ICE). This hydrogen engine, created under the H2-ICE consortium, not only produces ultra-low NOx and CO2 emissions but also provides the necessary torque and power for trucking applications. The innovative engine has successfully powered a hydrogen-fuelled Class-8 demonstration vehicle, showing promise in significantly reducing the substantial emissions generated by the trucking industry. The project involved a collaboration of experts from engine and truck manufacturers, fuels and lubricants providers, and Tier-I suppliers, aiming to showcase the potential of hydrogen-powered vehicles in complementing other zero-emission options to accelerate decarbonisation efforts. With a focus on achieving stringent environmental standards, the engine's design targeted ultra-low NOx levels to align with regulatory requirements. The H2-ICE's exceptional performance, featuring a 370-horsepower engine and an efficiency above 40% while emitting minimal CO2, offers a sustainable solution for long-haul trucking. Moreover, SwRI's innovative after-treatment system further reduces NOx emissions to levels significantly below industry limits, setting a new standard for environmentally-friendly heavy-duty applications. The successful development of the hydrogen engine signifies a step towards greener transportation practices, emphasizing the importance of collaboration and innovation in driving emission reduction and decarbonisation efforts in the industry.