At the Advanced Clean Transportation (ACT) Expo, the spotlight was on hydrogen as major automotive players like Honda, Hyundai, and Toyota revealed their plans for hydrogen fuel-cell trucks. Honda showcased a hydrogen fuel-cell big-rig concept, while Hyundai unveiled the latest iteration of its Xcient Semi powered by fuel cells. Toyota announced intentions to operate a fleet of hydrogen fuel-cell trucks in Southern California. Simultaneously, Volvo, Bosch, Cummins, and Cespira executives discussed their efforts in advancing hydrogen internal combustion engines (H2 ICE) for the trucking industry. They highlighted the existing mechanical knowledge, higher efficiency in certain scenarios, and lower emissions compared to diesel or natural gas trucks. The transition to hydrogen engines from traditional petroleum-based ones seems feasible due to the similarities in operation. H2 ICE engines work similarly to gas or diesel engines, injecting hydrogen into the cylinder head for combustion. This commonality allows for minimal modifications in integrating hydrogen engines into existing chassis, making repair and maintenance processes easier. From a regulatory perspective, H2 ICE vehicles are considered 'zero emissions' in some regions like the European Union. Additionally, hydrogen fuel can be transported by truck, enhancing its logistical feasibility in areas lacking electrical infrastructure. Despite industry enthusiasm, challenges persist. The process of extracting hydrogen from other elements is energy-intensive and costly, mainly done through steam-methane reforming. Hydrogen's tendency to bond with other elements like oxygen or carbon presents obstacles. The road to widespread adoption of hydrogen-powered vehicles still faces hurdles, but advancements in technology and industry cooperation signal a promising shift towards a cleaner and more sustainable future in the transport sector.