North America’s First Hydrogen-Powered ZEMU Passenger Train to Enter Service Sept. 13 in San Bernardino

The long-awaited passenger service debut of San Bernardino County Transportation Authority’s (SBCTA) hybrid hydrogen fuel cell-battery electric passenger train, known as ZEMU, will begin Metrolink service on Saturday, Sept. 13.

ZEMU, short for Zero Emission Multiple Unit, is North America’s first self-powered, zero-emission passenger train that meets Federal Railroad Administration (FRA) requirements. The train uses a hybrid hydrogen and battery technology to propel the train and power onboard electrical systems. Water vapor is the only emission generated from the propulsion system, making this a clean transit alternative.

ZEMU was built by Swiss train manufacturer Stadler and arrived in San Bernardino in June 2024. Since its arrival, the train has undergone extensive testing to ensure compliance with Metrolink systems and guidelines set by the FRA.

In August 2024, the California State Transportation Agency recognized SBCTA for its work to develop and bring online the nation’s first ZEMU passenger train. SBCTA’s efforts have created a framework for other transportation agencies to introduce ZEMU trains into their fleets.