Yandi One backtrack, following a cyclone shutdown of the mainline and severe flooding around Yandi a 'mixed' freight train was operated to Yandi to deliver food, mail and diesel fuel to the mine and camp. Here BHP Iron Ore CM40-8M unit 5639 'Corunna Downs' serial 8281-03 / 92-128 idles away in the backtrack awaiting its path back to Port Hedland with flat waggon 6703, four fuel tank waggons and a broken ore waggon. February 1997. GeoData.