High Quality Content by WIKIPEDIA articles! The Marlow Branch Line is a 7.25-mile (11.67 km) single track railway line between Maidenhead, Berkshire, Bourne End and Marlow, Buckinghamshire, England. Passenger services are operated by First Great Western using Class 165 diesel trains. The line connects to the Great Western Main Line at Maidenhead station, and uses a section of the former Wycombe Railway line to High Wycombe together with the former Great Marlow Railway.