CASTLE Hill MP Dominic Perrottet said work will soon start on a crossover cavern under Castle Hill as part of the $8.3 billion North West Rail Link.
"The crossover cavern is an important feature of the North West Rail Link's tunnels because it will allow trains to cross from one track to another," Mr Perrottet said.
"It will be built underground and to the east of the station area. While the train tunnels are circular and six metres in diameter, the crossover cavern is a larger rectangular shape with an arched ceiling.
"A roadheader tunnelling machine, with a cutting arm that moves both vertically and horizontally, will be used to dig the right shape for the crossover section.
"The roadheader is on site, and is being refurbished and assembled, ready to start tunnelling at Castle Hill."
Mr Perrottet said excavation work has started at the Castle Hill station "box" area, which is 196 metres long, 22 metres wide and 25 metres deep.
"We've been getting on with the job of building the North West Rail Link, with 189 reinforced concrete piles sunk up to 30 metres deep to support the perimeter of the station excavation at Castle Hill," Mr Perrottet said.
"Castle Hill is a major centre in the north-west that will only grow over time - and the North West Rail Link will help support that growth," he said.
"Castle Hill is set to support around 13,000 jobs by 2036, so the new station is a great opportunity to help further regenerate the town centre.
"At Castle Hill station, there'll be a train at least every five minutes in the peak which means customers won't need a timetable — you just turn up and go."
Recent works to prepare the site include:
The installation and painting of noise barriers around the site to reduce noise impacts;
Construction of site offices, worker facilities and workshops to maintain equipment used in the tunnelling activities;
Construction of an internal haul road to give trucks plenty of room to queue on site to remove crushed rock or to make deliveries; and
Delivery of equipment, including a drill rig, water treatment plant and ventilation equipment to support tunnelling out the crossover cavern.
Key features include:
Bus interchange on Old Northern Road for up to ten buses;
Taxi spaces off Old Castle Hill Road;
17 kiss-and-ride spaces on Old Castle Hill Road; and
Parking and storage for 20 bicycles.