ON THE ROAD — In the 1930s Lake Hart, not far south of Woomera, produced 9000 tonnes of the finest salt each year. The commercial operation failed because of the continuing difficulty of sourcing water to process the product, and the tyranny of distance from market. Today the Ghan railway runs beside the lake … but it doesn’t stop. The amazing sight of nearly 30km of brilliant white salt flats makes for a brief stopover for road travellers but there is little to linger for.