Bethungra Spiral
The Bethungra Spiral is a heritage-listed rail spiral on the Main Southern line near Bethungra, between Junee and Cootamundra. The spiral carries the northbound track, forming a part of the Sydney–Melbourne rail corridor. It is a listed heritage item, having been added to the New South Wales State Heritage Register on 2 April 1999.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).