JR Central in Japan has developed a prototype hydrogen engine hybrid system to replace diesel trains on non-electrified routes for zero CO2 emissions by 2050. This system, utilizing hydrogen as a clean fuel source through engines or fuel cells, builds upon the existing Series HC85 hybrid system. The prototype, undergoing rigorous testing at JR Central's Komaki Research Center, incorporates a hydrogen engine from i Labo Corporation, known for its durability, high power output, and efficiency. The key innovation is the modification of the engine to maintain constant speed for rail applications, paired with a new control system for optimizing efficiency. This project not only focuses on technological advancement but also aims for practical application in challenging terrains, reducing carbon emissions in mountainous and rural areas. By adopting hydrogen, JR Central is leading the way in sustainable rail transport, showing potential benefits in terms of efficiency, reliability, and environmental impact.