PREPARATION work for the North West Rail Link's skytrain has begun.
Demolition work at the Memorial Avenue construction zone at Kellyville started last week.
The construction site, bounded by Old Windsor, Memorial and Balmoral roads, will be the staging point for the construction of the skytrain and contain the project's second concrete mixing plant.
About 6000 cubic metres of concrete will be produced at the plant and distributed along the viaduct corridor.
Baulkham Hills MP David Elliott said the first construction works were proof the rail line was going "full steam ahead".
"I am pleased with the progress that has been made in such a short space of time with the North West Rail Link and delighted that our key election commitment is on its way to completion," Mr Elliott said.
The rail link's project team said the north-west T-way bus station will be unaffected by the construction but the T-way car park will be temporarily relocated to the eastern side of the bus station.
The four-kilometre skytrain will run from Bella Vista to Rouse Hill.