THE Hills residents are starting to believe the North West Rail Link will become a reality with major demolition work beginning this week.
Demolition work on office buildings at Baulkham Hills' Brookhollow Avenue started yesterday.
The site will become the underground Norwest station servicing 15,000 workers in the business park.
Transport minister Gladys Berejiklian said the work was a significant milestone.
"The North West Rail Link will give workers the opportunity for the first time to catch the train to work instead of battling congestion in the car and they will come from all across Sydney," Ms Berejiklian said.
The station is one of two in the business park which is expected to accommodate 30,000 employees by 2031.
The underground station will be integrated into Norwest Business Park with the street-level station entrance to be at the intersection of Norwest Boulevard and Brookhollow Avenue, opposite Norwest Marketown shopping centre and about 400 metres from Hillsong church.
Baulkham Hills MP David Elliott said the community needed to see the physical efforts being made to make the rail link a reality.
He said it was the best location for the station and construction zone given the building was only one storey among the other multi-storey buildings in the park.
The roundabout at Norwest Boulevard and Brookhollow Avenue will be replaced with traffic lights.
Norwest Boulevard will not be closed during the construction period but the west-bound carriageway will be temporarily diverted during 2014.
The station will have bus shelters, kiss-and-ride waiting areas, a taxi rank and cycling facilities.
The 23-kilometre North West Rail Link will run from Rouse Hill to Epping with The Hills commuters to change at Chatswood to travel into the city.
It is expected to be completed by 2019.
The project's second environmental-impact statement will be released for public comment in the next few weeks.