called it Brookdale, but later it was officially changed to Glenbrook in 1879, named after the nearby creek and Gorge. Glenbrook, which Sir John Jamison thought came from Regents Glen. A village sprung up near the station and was officially proclaimed Glenbrook, six years later. The Lapstone ZigZag opened in 1867, a part of the ascent of Lapstone Hill on a gradient of 1 in 30–33, which was built up the side of the range with comparatively light earthwork, although it includes the substantial seven-span sandstone Knapsack Viaduct. This was later widened to carry the old Great Western Highway, and it is now part of a walking trail on the old railway/highway alignment, including a memorial to the engineer in charge of the construction of the Blue Mountains line and many other early railways, John Whitton. In 1892 the first deviation of the railway up the Lapstone Hill, bypassed the Lapstone Zig Zag altogether. A tunnel was built through the hill to the Old Glenbrook station (subsequently dismantled). The 1892 Glenbrook Tunnel ran into trouble with water seeping from the nearby creek and the steep gradient making the climb hard for most trains, often getting stuck in the tunnel. In 1913 the second deviation of the railway line up Lapstone Hill was completed with a new double-tracked 1913 tunnel at the Bluff Point. The old 1892 Glenbrook Tunnel was subsequently closed. As a result of the new line, the Old Glenbrook station was relocated from next to the Great Western Highway to its current location next to the village of Glenbroook at the end of Ross Street, and was officially opened 11 May 1913. The abandoned 1892 Glenbrook Tunnel has been used to store mustard gas during World War II, and grow mushrooms in recent times. The eastern entrance can be still seen from a walking track at Lapstone. On 28 January 1941, an Avro Anson of No. 1 Air Navigation School, Parkes crashed near Glenbrook during a medical evacuation flight from Parkes to the Sydney Airport. All five crew members were killed. In 1999, the town was associated with the Glenbrook train disaster. Since 2005, the suburb has been the home of The Australian Gnome Convention organised by the Rotary Club of Lower Blue Mountains and held on Australia Day each year. Owners of garden gnomes display their garden decorations and compete for various awards to raise funds for