The southern end of the site near the River Gryfe was connected to what was then the LMS former Caledonian Railway line. The connection, just north of the former Georgetown railway station, dated back to World War I and the Georgetown Filling Factory. The railway connection was probably severed and the rail tracks lifted when the Inverclyde Line was electrified in the 1960s. Within ROF Bishopton's perimeter fence this line was still there in the 1990s, albeit with 20- to 30-year-old trees growing between the sleepers and rails.