High Quality Content by WIKIPEDIA articles! The Hamersley & Robe River railway, majority-owned by the Rio Tinto Group, and operated by its subsidiary Pilbara Iron, is a private rail network in the Pilbara region of Western Australia for the purpose of carrying iron ore. The network is larger than any other Australian heavy freight rail network in private ownership. The total length of its track is about 1,300 km (807.78 mi).