 stephen has over 20 years experience in the uk rail industry he joined porterbrook in march 2004 and his previous role was chief commercial officer in april 2021 stephen was appointed as chief portfolio officer tasked with supporting porterbrooks existing customers who lease more than 4 000 rail vehicles from the business his new team are responsible for developing and delivering a growing portfolio of rolling stock decarbonisation projects train based digital innovations and customer delivery partnerships 