Roy Hill track formation near the 63 km. Sleepers are moulded RH for Roy Hill and AS68 as manufactured to suit AS68 rail profile. The rail is moulded 136 10 VT NIPPON 2014 4 which translates to 136 Ib/yard (or 68 kg/m), 10 for Low Alloy, VT for processes of hydrogen elimination as Vacuum Treated, NIPPON is the manufacturer Nippon Steel, Japan, 2014 year rolled and 4 is month rolled.