Sandgate Flyover, Railway bridge in Newcastle, Australia

The Sandgate Flyover is a railway bridge that carries the Main North Line across Kooragang Island using two tracks made of prestressed concrete. The structure rises high above the surrounding landscape to create a grade separation.

The bridge was completed in 2006 by the Australian Rail Track Corporation to improve regional rail transport. It marked a turning point for Newcastle's infrastructure and modernised the railway connections serving the area.

The flyover takes its name from Sandgate, the Newcastle suburb west of Sandgate station where it stands. It separates the Main North Line from the Kooragang Island coal line, and beside it lies a siding used by Crawfords Freightlines. The 2006 opening gave the corridor two distinct routes where a single at-grade junction once forced coal and main-line trains to cross.

The flyover is a working freight structure west of Sandgate station with no public access or viewing platform; it is best seen from the station side or from public roads in Sandgate. The junction it replaced forced about 120 coal trains a day to cross the main lines, which also carried roughly 120 trains a day.

The structure solves a traffic conflict by raising the main railway line above the coal transport route, allowing both services to operate without crossing paths. This engineering solution reveals how smart design can untangle railway bottlenecks in busy port areas.