The San Bernardino County Transportation Authority introduced ZEMU, North America's pioneering self-powered, zero-emission passenger train, set to operate on Metrolink's Arrow Corridor. Referred to as the Zero Emission Multiple Unit, ZEMU incorporates hybrid hydrogen and battery technology, emitting solely water vapor and meeting Federal Railroad Administration standards. Manufactured by Swiss company Stadler, ZEMU joins the SBCTA's existing fleet and will accommodate 108 passengers on the San Bernardino Line. Following testing in Colorado under FRA guidelines, ZEMU is nearing service introduction after receiving significant funding from the California State Transportation Agency. California's Transportation Secretary highlighted the advantages of hydrogen-powered trains, emphasizing improved air quality, reduced noise pollution, and enhanced passenger comfort. The visually distinctive ZEMU is preparing for test runs on the Arrow Corridor, signaling a positive shift towards sustainable public transportation in California.