The nation’s first hydrogen-powered, zero-emission train rolled out of downtown San Bernardino midmorning Saturday, Sept.13, carrying its first passengers on Metrolink’s Arrow line.

The train, a Zero Emission Multiple Unit, or ZEMU , is the first of its kind for transit in North America. Manufactured by Stadler, a Swiss train maker, the train will operate exclusively on the 9-mile Arrow route between Redlands and San Bernardino .

The first hydrogen-powered, zero-emission train in the U.S. leaves the train station in San Bernardino on Saturday, Sept. 13, 2025. The Zero Emission Multiple Unit (ZEMU) train began passenger service Saturday and will operate on the 9-mile Arrow route between downtown San Bernardino and University of Redlands. (Photo by John Valenzuela/Contributing photog

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