The San Bernardino County Transportation Authority in California is making strides in innovative transportation with the introduction of North America's first federally compliant self-powered, zero-emission passenger train. This Zero-Emission Multiple Unit (ZEMU) utilizes a hybrid hydrogen and battery technology to propel the train and power its onboard systems, emitting only water vapor. The retrofit of a maintenance yard in San Bernardino County to accommodate hydrogen-fueled rail cars marks a milestone in sustainable public transportation. While hydrogen-fueled vehicles have been in use, the development of their passenger railcar equivalents is in its early stages. Railcars have higher energy requirements, necessitating specific infrastructure like enhanced ventilation, fire suppression systems, and sparkproofing. Challenges such as hydrogen leaks in tunnels, charging limitations, discharge rates, and fuel cell degradation need to be addressed to ensure the safety and efficiency of the hydrogen-powered railcar. Despite these hurdles, the deployment of the ZEMU two-car passenger train is expected to revolutionize rail transportation by offering a zero-emission solution for commuters. The initiative signifies a significant step forward in the adoption of sustainable transportation technologies, positioning San Bernardino as a pioneer in hydrogen-powered public transportation. The project's success could pave the way for future hydrogen-powered rail projects, contributing to a greener and more efficient transportation infrastructure in the U.S.