The San Bernardino County Transportation Authority has unveiled North America’s first self-powered, zero-emission passenger train, the ZEMU, set to begin service on Metrolink’s Arrow Corridor later this year according to a news release.

ZEMU, short for Zero Emission Multiple Unit, is North America’s first self-powered, zero-emission passenger train that meets Federal Railroad Administration requirements. It uses hybrid hydrogen and battery technology, emitting only water vapor.

Built by Swiss manufacturer Stadler, ZEMU joins SBCTA’s fleet, including three diesel trains that operate on renewable fuel.

The 108-passenger ZEMU will run on Metrolink’s Arrow Corridor on the San Bernardino Line. After arriving in San Bernardino in June 2024, the train began its final testing phase.

For nearly a year, ZEMU underwent testing under FRA guidelines at the Transportation Technology Center in Pueblo, Colo., ensuring safe entry into service. The California State Transportation Agency provided nearly $52 million to support ZEMU’s development.

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“Cleaner air, quieter trains and extra space on board are just a few of the outstanding benefits these hydrogen-powered passenger trains bring to the people of California,” said California Transportation Secretary Toks Omishakin.

ZEMU’s signature blue and white water-vapor design makes it easy to spot. Test runs on Metrolink’s Arrow Corridor are set to begin soon, aiming for service later this year.