 hydroflex offers zero emission rail travel hydroflex is the uks first hydrogen ready passenger train it can operate under electric battery and hydrogen power making it the worlds first tri mode train porterbrook has invested 8 million in the latest version of hydroflex and almost 30 uk companies have contributed to delivering the train over its 10 month build period supply chain partners have employed over 250 people on the project creating an economic value to those businesses of more than 6 million 