Reducing greenhouse gas emissions in transportation is a critical challenge, even though the rail sector accounts for only two percent of transportation emissions in the U.S. Ongoing advancements aim to further reduce emissions, with the U.S. government targeting a significant reduction by 2030 and a net-zero economy by 2050. One standout solution is hydrogen fuel, particularly for rail transportation, as highlighted in the U.S. National Blueprint for Transportation Decarbonization. Hydrogen's use in fuel cells can lead to zero greenhouse gas emissions, especially when produced from renewable sources like solar or wind. The Stadler ZEMU train, powered by hydrogen fuel cells and batteries, is a groundbreaking development in the U.S., set to operate in California with zero carbon emissions. Testing at the Transportation Technology Center in Colorado has demonstrated the train's performance and capabilities, including its impressive range. The center's hydrogen fueling station is a crucial asset, supporting advanced testing for various transportation modes, with plans for expansion to meet the increasing demand for hydrogen-powered vehicles.