The Lapstone Zig Zag was a zig zag railway built near Lapstone on the Main Western line of New South Wales in Australia between 1863 and 1865, to overcome an otherwise insurmountable climb up the eastern side of the Blue Mountains. The ruling grade was already very steep at 1 in 33 . Another of the early plans had been to build the whole line across the Blue Mountains on a completely different route through the Grose Valley with a 3-kilometre-long tunnel, but this was beyond the resources of the colony of New South Wales at the time. The track included the Knapsack Viaduct and a now abandoned station called Lucasville which was built for the Minister for Mines, John Lucas who had a holiday home nearby, the station opened in 1877.
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