Bit of an update on Pilbara car dumpers.
BHP have three at Nelson Point and two at Finucane Island.
Car rakes are up to 126, locos stay attached, no index or compressor cars are used any more. Index cars are only placed onto rakes when indexing arms fail. Each dumper has an indexing arm each side of the dumper.
FMG has three dumpers and use index and compressor sets, two cars. Locos run through dumper, spots up the train, then uncouples and runs forward then dumping starts.
Rio has the dumper at East Intercourse Island and two at Parker Point. Uses index and compressor sets, two cars. They don't have balloon loops, unlike BHP and FMG.
At Cape Lambert they have three dumpers in the new South Yard, the original single cell dumper for Robe Valley cars and the 'West Angelas' dumper next to it. Again all using index and compressor car sets, and no balloon loops. And locos detach prior to dumping.
The former GML used belly dump wagons upto the removal of the unloader at Finucane Island then converted some cars back to rotary operation and then used any wagons in the BHP fleet.
BHP also have a dumper at Mt Whaleback in Newman which was used for shuttle operations from Jimblebar to whaleback.