The joint Coal Board's new 12 cubic yard "Walking" dragline excavator which has just arrived in Sydney. This is how the machine will appear when assembled, and in ***** in a Western district open-cut mine in February. New Giant - "Walking" excavator which was unloaded in Sydney today for use on open-cut mines. It is almost as wide as Martin Place and cost $250,000. The machine, a dragline excavator bought in the US by the Joint Coal Board, is expected to uncover an extra 700,000 tons of a coal a year. November 15, 1949.