 porterbrooks innovative hydroflex train has undergone extensive mainline testing reaching speeds of 90mph and travelling up lickey hill the steepest mainline incline in the uk the vehicle also became the first uk train to safely travel through a tunnel on hydrogen power built and tested at our long marston rail innovation centre the hydroflex project began in 2018 with a class 319 train converted to run on hydrogen and battery power the original hydroflex train was developed in partnership with the university of birmingham with grant funding from innovate uk a branch of the uk government 