German regional transport group RMV began construction on Monday of a filling station near Frankfurt that will use hydrogen generated as a by-product of chemicals manufacturing to fuel the world's largest fleet of zero-emissions passenger trains.

France's Alstom will deliver 27 hydrogen-powered fuel cell trains to the Infraserv Hoechst industrial park in the Rhine-Main region in mid-2022. Starting regular local services by that winter, the fleet will replace diesel engines.