A project of this size and complexity requires a large amount of planning before on-site construction can begin.

What’s happened?

Activities undertaken to date include:

• preliminary design works, including formation, drainage and geometric design
• geotechnical and utility services investigations
• short-listing of three consortia to undertake detailed design and construction works
• planning for the replacement (bus) service while the track work is being undertaken and calling the contract for supply of this service
• placement of an order for design and manufacture of 110 000 gauge-convertible, concrete sleepers (suitable for Belair and Noarlunga lines). 

What’s next?

It is expected that the main contract to undertake the detailed design and construction works will be awarded to a consortium in early 2009.

At least two months detailed design work by the successful contractor will be required before construction can begin.  This detailed design work is needed to finalise design aspects including: 

• track alignment and geometry
• modifications to signals and communication infrastructure
• drainage improvements
• interfaces with station platforms as well as pedestrian and level crossings
• earthworks requirements. 

Further details of the timing and length of the construction works will be available in early 2009 and will be provided to the local community and train commuters as soon as possible.