The Sierra Railroad Company (SRC), a historic railroad in California, has embarked on a journey to decarbonize its fleet by transitioning to hydrogen-powered locomotives. In response to California's energy crisis, SRC explored alternative fuel sources and initially shifted to biodiesel. Seeking further decarbonization, the company turned to hydrogen production using gasifier technology fueled by bio-derived and waste feedstocks. They established a hydrogen production facility in Monterey County, California, utilizing high-temperature gasification with the FastOx process. SRC converted a diesel locomotive into a hydrogen fuel cell-powered unit at its West Sacramento yard, showcasing a self-reliant business model for hydrogen railroads. The company's first-generation hydrogen locomotive, SERA 193, was developed in-house by retrofitting a GE RP20BD freight locomotive with zero-emission hydrogen fuel cell technology. The locomotive was outfitted with modular components, including fuel cells, batteries, and hydrogen storage tanks, allowing for efficient assembly and flexibility in upgrades. The project, supported by the California Energy Commission, underwent extensive safety testing and compliance measures to ensure regulatory adherence. The hydrogen locomotive's weight reduction and advanced traction control technology have demonstrated improved performance in pulling heavier loads without the need for additional ballast. SRC's innovative approach to hydrogen-powered locomotives highlights a sustainable and forward-thinking strategy in the railroad industry.