Cougal Spiral, Heritage railway tunnel in Border Ranges, Australia.
The Cougal Spiral consists of three concrete tunnels measuring 192 meters, 177 meters, and 1,160 meters in length along the North Coast railway line.
The railway infrastructure opened on August 29, 1930, connecting New South Wales with Queensland through a complex series of tunnels and spiral formations.
This engineering structure represents a milestone in Australian railway development, enabling transport connections between northern New South Wales and Brisbane.
The spiral formation allows trains to gain 30 meters in elevation without forward progress, maintaining a consistent gradient of 1 in 66 throughout the track.
Trains pass directly over the lower tunnel section while climbing the spiral, creating a double-level railway configuration in the mountainous terrain.
Location: New South Wales
Official opening: August 29, 1930
GPS coordinates: -28.35440,152.96400
Latest update: March 4, 2025 14:43
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