This bolt is significant for two reasons: as a reminder of the engineering feat involved in building a railway across the Blue Mountains and as an example of the 'historic ephemera' collected by the Royal Australian Historical Society as it sought to document colonial history. It comes from the first railway line which was built between 1863 and 1867. Although the engineer, John Whitton, wanted to excavate a tunnel limited funds meant he had to design a zig zag at Lapstone. Glenbrook was the first railway station on the line which opened up as far as Weatherboard (Wentworth Falls) on 13 July 1867 and to Mount Victoria the following year.

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Powerhouse Museum