Lapstone Viaduct and Zig Zag
  • Length: 1.5km

  • Duration: 30 mins

  • Grade: 2

  • Style: One Way

  • Start: Lapstone

  • End: Lapstone

  • Closest Town: Lapstone

  • Location: Sydney and Blue Mountains

  • Distance from state capital: 60km

  • State: NSW

  • Latitude: -34.72385079

  • Longitude: 149.7445086


Lapstone Viaduct and Zig Zag is a 1.5km, grade 2 One Way hike located in Sydney and Blue Mountains New South Wales. The hike should take approximately 30 mins to complete.


An historic abandoned viaduct and zig zag on part of the first railway line constructed over the Blue Mountains.

The former railway route adopted involved an impressive sandstone viaduct over Knapsack Gully. The viaduct was the largest in Australia, being 388 feet long and 120 ft high with 5 spans of 55 ft and 2 of 20 ft.

Construction commenced in 1863. The line was opened to Weatherboard (now Wentworth Falls) on J Originally built to carry a single railway track, the bridge was later fitted with a new concrete deck, enabling it to carry 2 lanes of road traffic. It formed part of the Great Western Highway until being by-passed in the mid 1990’s. Today it is used only by pedestrians, bicycles, emergency vehicles, & the Olympic Torch Relay.


Lapstone to Lapstone in Sydney and Blue Mountains

Blue Mountains, 60km west from Sydney

Coarse gravel

Flat to slight incline

For more information and a location map please visit RailTrails Australia.