What is the history of the Zig Zag Railway in the lower Mountains and where was it

The Lapstone Zig Zag was a zig zag railway built between Emu Plains and Blaxland stations on the Main Western line of New South Wales in Australia. Constructed between 1863 and 1865 to overcome an otherwise insurmountable climb up the eastern side of the Blue Mountains, the zig zag and associated Knapsack Viaduct, a sandstone arch viaduct, were designed by John Whitton, Engineer-in-Charge of New South Wales Government Railways, and were built by William Watkins. The zig zag was listed on the Blue Mountains local government heritage register on 27 December 1991; while the adjacent Knapsack Viaduct was listed on the New South Wales Heritage Database on 2 April 1999. The Lapstone ZigZag was the world-first ZigZag constructed on any main-line railway.

The zig zag closed in 1892 when the Main Western line was diverted via the Glenbrook Deviation and subsequently sections of the line were repurposed as the Great Western Highway, and later use as a walking track.

More here: https://en.wikipedia.org/wiki/Lapstone_Zig_Zag

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Lapstone Zig Zag