of New South Wales. The tunnel itself has minimal archaeological research potential. However, the navvy camp near the Mullet Creek portal has considerable potential to inform our understanding of the working lives of railway construction workers. Archaeological remains of railway workers camps on the scale likely to remain at the Woy Woy tunnel are rare in NSW. The place possesses uncommon, rare or endangered aspects of the cultural or natural history of New South Wales. The tunnel is not rare. There are numerous other examples of this construction in the State and on the Short North line, including Tickhole Tunnel and the tunnels in the vicinity of the Hawkesbury River Rail Bridge. It is however, the longest tunnel outside the Sydney underground network, which makes it distinctive. The place is important in demonstrating the principal characteristics of a class of cultural or natural places/environments in New South Wales. The tunnel is a good example of its type and is representative of double track railway tunnels within the NSW rail network. It is the oldest tunnel still in use in NSW and the longest tunnel outside the Sydney underground rail network. Tragedies See also List of tunnels in Australia Notes 1. Circa 1886, both Australian and imported cement was packaged in wooden casks, each containing 3 bushels, about 4 to 4.25 cubic feet (about 170 kg net) depending upon the fineness of the cement. The density of cement specified in 1886 for City of Sydney use was 112 to 113 pounds per bushel. References Attribution External links Transport on the Central Coast (New South Wales) Railway tunnels in New South Wales Tunnels completed in 1887 Works of John Whitton New South Wales State Heritage Register Central Coast Council (New South Wales) Main North railway line, New South Wales