In a precision operation carried out over five nights, 12 segments of the Sydney Metro Northwest skytrain were lifted over Memorial Avenue at Kellyville.
Each of the segments weighs about 84 tonnes and were lifted 11m into the air by the massive horizontal crane sitting above Memorial Avenue.
The segments were then attached and tensioned to form the deck of the skytrain, an elevated railway that will run 4km from Bella Vista to Rouse Hill.
The construction method kept traffic moving beneath seven major roads and the T-way, which the skytrain crosses to minimise impact on drivers.
Once the skytrain is built, people and vehicles will be able to freely move around underneath, keeping the area connected.
Work will also start on the elevated railway stations at Kellyville and Rouse Hill (two of the eight new metro stations) once the skytrain is complete.