Swiss train producer Stadler Rail AG (<a href="https://www.six-group.com/en/products-services/the-swiss-stock-exchange/market-data/shares/share-explorer/share-details.CH0002178181CHF4.html#/" target="_blank">SWX:SRAIL</a>) will be supplying four hydrogen-powered trains to the state of California under a USD-80-million contract with the California Department of Transportation (Caltrans).