Assertion: zig zag | /r/HasProperty | built by william watkins
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text: 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 Chief of New South Railways, and were built by William Watkins.